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Environmental impact assessment: cleaning up taiwan’s contaminated soil, heavy metals are making it into the food supply, contaminating the nation’s rice, with the permissible level of the toxic pollutant cadmium double that of china.

• By Steven Crook

Taiwan’s extraordinary natural diversity extends to its soils.

The US Department of Agriculture divides soils into 12 orders, and Taiwan is the only place in the world where a researcher can collect samples of 11 of these in a single day, says Young Chiu-chung (楊秋忠), an academician in Academia Sinica’s Division of Life Sciences. The only soil order not present is gelisols (soils that contain permafrost).

Soil isn’t just the substrate in which much of our food is grown. Because it stores a great deal of carbon, it’s also a key variable in climate change.

Throughout Taiwan, rice grows in close proximity to industry.

Photo: Steven Crook

Asked if the health of Taiwan’s soils is declining, Young says, “Some soils in Taiwan are in greater danger now than 30 years ago, because, in some places, irrigation water isn’t separated from domestic and industrial discharges.”

If there are houses or factories next to farmland, he says, wastewater may enter those fields, and the soil may gradually accumulate toxins or heavy metals like lead and cadmium, the latter of which increases the risk of developing various organ diseases, including chronic kidney, heart and lung diseases, as well as nervous tissue disorders, according to recent studies.

The gradual loss of arable land due to urban sprawl is another negative, he says.

Contaminated sediments that accumulate in irrigation ditches threaten to pollute previously-remediated farmland.

On the other hand, government afforestation efforts have benefited water resources, and there’s a very strong two-way link between water quality and soil health.

Young urges people who have a garden or some farmland to apply organic fertilizers to the land.

“This will increase the soil’s organic-matter content and improve its fertility and productivity,” says Young, who spent most of his career teaching at National Chung Hsing University (NCHU). He is the founder of Tetanti AgriBiotech, a company which supplies enzyme products and machinery that can rapidly convert organic waste into organic fertilizer.

A farmer in March works in a field on the Jianan Plain in Chiayi County.

Photo: Chang Chung-yi, Taipei Times

Property owners shouldn’t apply pesticides to their land, nor use it as a dumping ground.

“Pesticides and waste can contaminate soil. Pesticides may kill non-target organisms, damaging soil biomass and microorganisms such as bacteria, fungi and earthworms,” he says, adding that microbial biomass plays an important role in the cycling of nutrients (carbon, nitrogen and phosphorus being the main ones).

HEAVY METALS

The threat posed by heavy metals — which can reduce crop yields and contaminate the food chain — is especially severe in Taiwan. The country not only has an exceptional number of factories for its land area, but also a form of agriculture that exacerbates the problem.

A study of cadmium contamination affecting Taiwanese rice published earlier this year in Environmental Science and Pollution Research points out that, compared with other crops, rice is more able to absorb toxins from soil and water.

“Paddy plants are grown under flooded conditions, which enable toxic elements to be absorbed by the roots of the plants and accumulate. The anaerobic conditions in paddy soil increase the bioaccessibility of toxic elements for rice,” write the authors, who are affiliated with National Taiwan University (NTU) and National Taiwan Ocean University.

Alarmingly, they note that the accumulation of non-biodegradable toxic elements means “their presence in marketed rice is essentially unavoidable” — and that the permissible level of cadmium in rice in Taiwan, at 0.4mg per kg, is double that in China. (Taiwan’s limit matches that set by the Codex Alimentarius Commission, the UN’s food safety body; the standard in Japan was lowered from 1.0mg per kg of unpolished rice to 0.4 in 2011.)

Chen Zueng-sang (陳尊賢), associate dean of the Taiwan Research Institute on Water Resources and Agriculture and formerly a professor in the Department of Agricultural Chemistry at NTU, is one of Taiwan’s leading experts on the removal of pollutants from soil, a process known as remediation.

A 2011 conference paper Chen co-authored for the East and Southeast Asia Federation of Soil Science Societies describes three soil remediation techniques.

Turnover and dilution — mixing surface soil with subsoil to reduce the concentration of heavy metals in the former — is cheap and fast. Moreover, compared to other remediation techniques, it has a minimal impact on crop production.

Chemical treatments aim to stabilize heavy metals in a form where they’re less likely to enter food crops via their roots. Experiments in contaminated fields indicate that adding calcium carbonate, manganese oxide and zeolite considerably reduces the extractability of cadmium and lead in soils, and cuts the uptake of those heavy metals by wheat shoots.

The third approach is phytoremediation, the use of particular plant species and associated microorganisms to clean up contaminated soil. This sounds like an ecologically-sensitive approach, but it’s not that simple. It’s been found that applying what are called chelating agents to the soil leads to greater concentrations of various heavy metals in the shoots of certain plants. However, using such agents — which boost the solubility and leaching of heavy metals — also increases the risk of groundwater contamination.

Chen has joined several experiments which aimed to identify what plants are best for soil decontamination.

One, reported in the International Journal of Phytoremediation in 2010, started by planting 33 different species on a polluted site in central Taiwan. After 31 days, Garden canna and Garden verbena had found to be especially effective at accumulating chromium; Chinese ixora and Kalanchoe for copper; rainbow pink for nickel; French marigold for zinc; and sunflowers for both nickel and zinc.

Phytoremediation isn’t a rapid process. Getting heavy metal contamination down to an acceptable level may take several planting-to-harvest cycles.

DEALING WITH CONTAMINATED SOIL

The Environmental Protection Administration’s (EPA) 2019 Annual Report on Soil and Groundwater Pollution Remediation mentions other responses to soil contamination, such as removing it for processing off-site, or using it to cover landfill sites. Since mid-2019, subsidies have been available so landowners can set up ground-based solar-power systems on polluted plots.

According to the report, at the end of 2019, the EPA was aware of 7,360 contaminated farmland sites covering a total of 1,178 hectares, slightly more than the previous year. Taiwan has just over 790,000 hectares of agricultural land.

Some 53 percent of the total contaminated land area is in Changhua County. Another 30 percent is in Taoyuan, while 8 percent is in Taichung

Every year since 2012, the EPA’s Soil and Groundwater Pollution Remediation Fund Management Board has spent more than NT$1 billion on cleanup efforts.

The EPA began analyzing soil contamination in 1983. However — as noted by a paper authored by a team from National Taiwan Ocean University and published late last year in Sustainability — few studies have “discussed the direct and cumulative effects of channel water quality and sediment [heavy metal] concentrations on [heavy metal] in paddy soil.”

The scientists tested water-channel sediments and irrigation water for heavy metals, and compared the results with what they found in nearby fields. Even allowing for atmospheric deposition of pollutants and the presence of heavy metals in fertilizers, they concluded that pollution came mainly from water and sediment in irrigation ditches.

Citizens who eat rice daily should pay particular attention to the paper’s assertion that most of the contaminated sediments in irrigation channels have yet to be properly treated, and that the EPA’s longstanding strategy “only focuses on monitoring the quality of discharge and irrigation water.”

The scientists argue that better management of irrigation systems, especially of sediments contaminated with heavy metals, should take priority over remediation of fields. Even though the discharge of wastewater from the country’s industrial sites is more tightly regulated than it used to be, there’s a risk that farmland will be recontaminated.

Steven Crook, the author or co-author of four books about Taiwan, has been following environmental issues since he arrived in the country in 1991. He drives a hybrid and carries his own chopsticks.

This column does not necessarily reflect the opinion of the Taipei Times.

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Changes in plant species abundance alter the multifunctionality and functional space of heathland ecosystems

Affiliations.

• 1 Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, Vienna, 1030, Austria.
• 2 Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra, Catalonia, E-08193, Spain.
• 3 Division of Biology, Imperial College London, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK.
• 4 Research Division III, Taiwan Research Institute on Water Resources and Agriculture (TRIWRA), 19F, No. 27-8, Section 2, Zhongzheng East Road, Tamsui District, New Taipei, 251, Taiwan.
• 5 Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia.
• 6 Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt, D-60325, Germany.
• PMID: 34346089
• DOI: 10.1111/nph.17667

Though it is well established that species composition affects ecosystem function, the way in which species combine to control overall ecosystem functioning is still debated. In experimental mesocosms, we planted three functionally distinct dry-heath species in varying proportions and measured multiple ecosystem properties related to nutrient cycling and carbon storage (hereafter functions). Overall ecosystem functioning was described as the main axes of variation in ecosystem functioning (functional space) and the proportion of ecosystem functions at high levels; for example, fast carbon and nutrient cycling (cluster-based multifunctionality). The first functional space axis, related to nitrogen availability, was driven by plant species abundance, particularly that of legumes, which strongly affected many individual functions. The second, related to total plant biomass and woodiness, was mostly driven by the abundance of dwarf shrubs. Similarly, cluster-based multifunctionality was related to the initial abundance of all species, but particularly the legume. Interactions between species also affected ecosystem multifunctionality, but these effects were smaller in magnitude. These results indicate that species interactions could play a secondary role to species abundance and identity in driving the overall ecosystem functioning of heathlands, but also that axes of variation in functional space are clearly linked to plant functional composition.

Keywords: biodiversity; biodiversity-ecosystem functioning; competition; functional space; lowland heath; multifunctionality; plant species abundance; soil processes.

© 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation.

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Risk-based irrigation decision-making for the Shihmen Reservoir Irrigation District of Taiwan

• Published: 30 June 2023
• Volume 21 , pages 497–508, ( 2023 )

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• Sheng-Fu Tsai 1 ,
• Dong-Hong Wu 2 ,
• Gwo-Hsing Yu   ORCID: orcid.org/0009-0008-3500-8623 3 &
• Ke-Sheng Cheng 4  

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The Shihmen Reservoir is the most important source of water supply for domestic, industrial, and agricultural sectors in northern Taiwan. Competition for water demands among the three sectors frequently occurs. In circumstances of prolonged drought, the agricultural water supply is reduced to meet the water demands of the domestic and industrial sectors. In making irrigation decisions, several irrigation scenarios may be proposed and evaluated to reach the final decision. However, the risk of irrigation decision-making often is not fully investigated in the decision-making process. In this study, we present an innovative risk-based irrigation decision-making approach for the Shihmen Reservoir Irrigation District in northern Taiwan. The approach, by considering the initial reservoir storage and the cumulative reservoir inflow, derives the cumulative distribution function of the available volume for irrigation and then calculates the risk of irrigation shortage, defined as the probability that the available volume for irrigation is lower than the irrigation water demand. A severe drought event that occurred in 2021 was used to demonstrate the application of the proposed approach. It was found that the drought mitigation measures taken by the Irrigation Agency for the 2021 drought event ensured a very low risk of irrigation shortage.

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Irrigation Agency, Council of Agriculture, Executive Yuan, New Taipei City, Taiwan, ROC

Sheng-Fu Tsai

Taiwan Agricultural Research Institute, Council of Agriculture, Executive Yuan, Taichung City, Taiwan, ROC

Dong-Hong Wu

Taiwan Research Institute on Water Resources and Agriculture, New Taipei City, Taiwan, ROC

Gwo-Hsing Yu

Department of Bioenvironmental Systems Engineering/Master Program in Statistics, National Taiwan University, Taipei, Taiwan, ROC

Ke-Sheng Cheng

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Tsai, SF., Wu, DH., Yu, GH. et al. Risk-based irrigation decision-making for the Shihmen Reservoir Irrigation District of Taiwan. Paddy Water Environ 21 , 497–508 (2023). https://doi.org/10.1007/s10333-023-00943-9

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DOI : https://doi.org/10.1007/s10333-023-00943-9

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Precision agriculture in taiwan: examples and experiences.

Since 1997, Taiwan has been planning for precision agriculture. In 1999, a pilot project was launched with rice as the target crop, entitled “Studies on Precision Farming System for Rice (1999-2002).” Although this four-year project cannot solve all rice production problems comprehensively and effectively, the concept of precision agriculture and the development of related technologies have progressively spread to various fields of agricultural research. Moreover, through various experimental studies conducted by different research institutions, a large number of experimental data has been accumulated, and it has gradually expanded to the production and application of various agricultural products. In the era of booming information and communication technology (ICT), as well as the fact that the proportion of aging farming population has increased year by year, the corresponding result is a shortage of labor in Taiwan. Therefore, precision agriculture at this stage has introduced elements of smart agriculture. With that, the Productivity 4.0 project and the Smart Agriculture Project were initiated in 2016 and 2017, respectively, by the Council of Agriculture (COA) of Taiwan (ROC). The development of precision agriculture systems has been listed as one of the three major areas of these two projects. This paper introduces Taiwan's research findings and industrial application examples of precision agriculture in the Smart Agriculture program, including crop quality production system, soil nutrition and irrigation management with geographic information system (GIS), crop disaster prevention and warning system, decision-supporting system for pest management, etc. These examples and experiences may apply to small holders for countries in the Asia-Pacific region.

Key words: Precision Agriculture, Smart agriculture, Crop quality production system, Pest management, Soil nutrient and irrigation management with GIS-

INTRODUCTION

Due to the global warming trend as well as rapid climate change, the occurrence of extreme weather events is becoming more frequent and more intense. The phenomena further intensify challenges facing global agricultural production. The concept of Precision Agriculture (PA) emerged in the 1980s, based on observing and responding to intra-field variations in a site-specific way. Such a farming management incorporates appropriate cultivation techniques combined with long-term accumulated farming information and derived decision-supporting systems, such as soil nutrition and meteorology, and equipment, such as variable-rate sprayers and yield monitor, offering farmers more effective cultivation management to achieve maximal benefits with minimal inputs in crop production (Reyns et al., 2002).

Taiwan began planning for PA in 1997 and launched a pilot project called ‘ Studies on Precision Farming System for Rice (1999-2003)’ (Lin and Yang, 2000).This project included three research themes—Soil Fertility Status and Monitoring System, Decision-supporting System for Rice Cultivation and Environmental management, and Precision Agricultural Machinery and Operating Systems (Yang and Lin, 2003). Although this four-year project cannot solve all rice production problems comprehensively and effectively, the concept of precision agriculture and the development of related technologies have progressively spread to various fields of agricultural research.

Moreover, through various experimental studies conducted by different research institutions, a large number of experimental data has been accumulated to manage rice plants and soil. Moreover, site-specific techniques have been developed extensively. It has also gradually expanded to the production and application of various agricultural products. A preliminary system for image recognition and a prototype of grain yield monitoring equipment have been established. Some spectral models to assess growth status, pest infestations and yield production were developed based on ground truth from project studies. Results of simulation from satellite spectral data were compared with estimates from models of hyperspectral data. In recent years, measurements and model development from imagery taken from unmanned aerial vehicles (UAVs) or drones have been done and applied to the detection of plant nutritional status, monitoring and surveillance of natural disasters, and assessing the incidence and outbreak of pests and diseases.

As to the development of decision-supporting system, an algorithm to assist fertilization decision-making has been built. The dosage and distribution rate of nitrogen fertilizer can therefore be recommended to farmers in line with varieties, planting time and yield potential, etc. (Yang and Lin, 2003). More recently, an Integration Information Platform for Crop Quality Production has been developed for farmers to find effective and proper ways, through the Internet of Things (IoTs), to grow a crop.

In the era of booming information and communication technology (ICT), as well as the fact that the proportion of aging farming population has increased year by year, it results in a shortage of labor in Taiwan. Therefore, PA at this stage has introduced elements of Smart Agriculture (SA). Through the combination of digitalization and intelligent technology and precision equipment, coupled with industrial processes and the use of Big Data and IoTs, the agriculture sector anticipated to achieve the goals of improving production efficiency, reducing labor costs and increasing product returns, thereby attracting and inspiring young people to pursue a career in agriculture/farming. With that, the Productivity 4.0 project and the Smart Agriculture Project were initiated in 2016 and 2017, respectively, by the Council of Agriculture (COA) of Taiwan (ROC). The development of PA systems has been listed as one of the three major areas of these two projects. This paper introduces Taiwan's research findings and industrial application examples of PA in the SA program, including quality crop production system, soil nutrition and irrigation management with geographic information system (GIS), decision-supporting system for pest management, crop disaster prevention and warning system, etc. These examples and experiences may apply to small holders for countries in the Asia-Pacific region.

CROP QUALITY PRODUCTION MANAGEMENT SYSTEM

Integration of information platform for crop quality production

Most of the farmland cultivated by farmers in Taiwan is less than 1 ha, and may be divided into several blocks for various crop species. The soil texture and structure are not even uniform in a piece of farmland, similar to soil fertility. Thus, cultivation management of a crop requires more elaborate planning for each of blocks. The Integration Information Platform for Crop Quality Production was developed to provide needed information for farming (Fig. 1). The databases include growth traits of crop varieties, farming practices and management, disease and pest control methods, epidemic and outbreak notification, and fertilizer use, etc. With this integration information platform, it will help farmers to create their own dynamic management operations during growing period, analyze and compile various growth data into useful cultivation information, generate traceable information for certified agricultural products, and produce statistical reports to meet the needs of operators/growers. It also provides farmers with practical application of field management through mobile application (APP) software.

Fig. 1. Homepage of the ‘Integrated Information Platform for Crop Quality Production’. ( https://kiscrop.tari.gov.tw/ )

The prediction model for growth stages based on the daily effective accumulated temperature (growing degree days; GDD) during a growing season can also be yielded from the platform (Lin et al. , 2014). In addition to providing a reference for more precise cultivation management in the farmer's own field, this platform also provides information to the database for more effective analysis as well as extended information for different regions, seasons and cultivation practices.

Soil fertilization and plant nutritional status analysis

Fertilization with proper types and amounts in the appropriate period of crop growth are important tools to stabilize or increase yield and quality of a crop. Rationalized fertilization can not only improve quantity and quality of crop production but also reduce the waste of resources and enhance the protection of the ecological integrity. Research institutions under the Council of Agriculture (COA), including the Taiwan Agricultural Research Institute (TARI) and each District Agricultural Research and Extension Station (DARES), provide farmers with knowledge and correct information of fertilizer application through the rationalized fertilization workshop every year. They also provide the service of soil or plant nutritional status analysis for individual farmlands as a basis for farmers to apply fertilizers. There are at least 200 workshops held and 15,000 farmers participate in each year, and over 30,000 soil or plant samples are analyzed per year.

The Soil Geographic Information System (GIS search system) established at TARI can provide services at farm level for soil information (nutrient components and physical properties) through internet (Fig. 2). Government agencies may use the accumulated information in the center to estimate yield potential and locational distribution in various regions and design a cultivation plan.

Fig. 2. Homepage of the ‘Soil GIS Search System’.( https://farmcloud.tari.gov.tw/SOA/index.aspx )

The service of diagnosis of plant nutritional status can give instructions to farmers to use fertilizer properly. On the other hand, non-destructive nutrition diagnosis provides effective technological support for PA. The technologies include remote sensing with hyperspectral imaging analysis and digital image processing analysis in nondestructive nutrient status diagnosis and drought (Fig. 3) (Lee et al. , 2007; Lee et al. , 2008; Shen et al. , 2000; Shen and Chang, 2003). The drone-based phenotyping is now actively being studied for developing various image systems and analyzing algorithms that can be used for nutritional status analysis, fertilization and pesticide application non-destructively.

Fig. 3. (A) Maps of canopy N status of rice paddy obtained from three different regions of a rice field applied with different rates of N fertilizer, taken with a simplified imaging system unit mounted on a mobile lifter. (B) Validation of the relationships between the chemically analyzed and the image analyzed N (%) values from three different regions of a rice field applied with different rates of N fertilizer. (adapted from Lee et al., 2008)

Research and development on field intelligent management

In PA, the field management coupling with the application of intelligent sensors is one of the important trends in the SA. Through wireless network transmission and IoTs technology, the efficiency of field operations can be greatly improved. For instance, in the case of rice irrigation, the usage of intelligent sensors for water management of alternate wetting and drying (AWD) irrigation can promote water consumption more effective than conventional irrigation management. It saves water consumption for 30.9% and 49.8% in the first crop and second crop seasons, respectively, but the yield and physiological characteristics are not affected under AWD management condition (Wu et al. 2019).

The light integral control logic algorithm and the local automatic fertigation system were developed by light integral irrigation technology based on the principle of crop evapotranspiration (ET; ET = soil evaporation + crop transpiration). According to weather changes, the timing and frequency of irrigation can be adjusted intelligently (Chen and Chen, 2014). The irrigation interval is automatically shortened on sunny days, but the number of irrigation practice is increased to 8 to 13 times, especially the irrigation interval before and after noon when ET is the strongest shortened to 0.5 hr. In contrast, the irrigation interval is automatically extended on rainy days, irrigated 2-5 times and irrigated once every 2-3 h. The application of light integral irrigation technology can effectively reduce the amount of irrigation water and nutrient solution in rainy days by 58-61%. This simple, low-cost and stable irrigation technology can improve the shortage of high cost of complete and accurate ET sensing and rainfall sensing equipment, and need to be maintained regularly (Chen and Chen, 2014).

PESTS AND DISEASES MONITORING SYSTEM AND MANAGEMENT

The monitoring and management of pests and diseases is also an important strategy in the crop production process. Farmers always use comprehensive control by spraying chemicals. In addition to the high labor cost, it also has an influential impact on the environment. It is a key point of PA with proper control of pests and diseases by practicing in suitable time, dosage and plant parts. The Crop Pests and Diseases Information System is one of the services of Integration Information Platform for Crop Quality Production. The system provides instant online diagnostic services, which can be based on the crop growth period, plant parts, and damage symptoms (e.g., texture, color and other conditions). The outputs of appropriate diagnostic results and pesticide control information are valuable for users in planning farming practices.

The Intelligent Management Decision System for Agricultural Pests integrates the results and findings from research at TARI for many years in facilities, includes Phalaenopsis, vegetables, fruit trees and stored products (Fig. 4). It is a practical and feasible example based on the monitoring and effective management of key pests. The query system has an interactive search function. The users can identify common pest types, risks and related consultations in the shortest time. For example, pest search can quickly find relevant pest ecological and hazard information, including text, audio video output, and integrated prevention instruction. Integrated pest management (IPM) knowledge-based inquiries focus on the integrated management of application examples or important crop pests. The report also provides a complete information of the workshop. Image consultation can upload pest photos or crop hazards according to farmers, assist in the study of pest species and provide prevention information. It outputs practical methods for pest management to reduce the improper use of pesticides and improve safety and quality of agricultural products.

Fig. 4. Homepage of the ‘Intelligent Management Decision System for Agricultural Pests’. ( http://azai.tari.gov.tw/aisearch/index.html )

Pest management platform for stored products

During rice production process, in addition to the losses caused by pests and diseases in the field, grain storage period is often affected by stored product pests. It may result in about 2-5% grain loss, with an estimated annual loss of more than US$6.6 million. The main stored product pests of rice are Sitophilus oryzae (L.), Rhyzopertha dominica (Fabricius) and Sitotroga cerealella (Olivier). The comprehensive prevention and management of major stored product pests has been developed, including light emitting diode (LED)-based pest traps, wireless sensor network (WSN) pest monitoring technology and anti-insect netting. From the perspective of prevention, this is considered as better than chemical treatments. The construction of a complete grain pest management model should include information of the government-owned grain barns, imported grains and small packaged rice together. It is implemented by four prevention stages of pest control, from source cleaning, anti-blocking, monitoring to control practice, to enable barn managers to obtain maximum benefits. The build of Pest Management Platform and Monitoring System for Stored Products (Fig. 5) ( http://spir.tari.gov.tw/ ) provides a networking for users to learn, consult and communication (Yao and Lee, 2017).

Fig. 5. Homepage of the ‘Pest Management and Monitoring System for Stored Products’. ( http://spir.tari.gov.tw/ )

The equipment of LED-based insect traps for stored product pests is developed to trap the grain pests. In particular, it has excellent trapping effect on the major pests in rice storage. The maximum number of traps per 10 minutes is 2,500, and the estimated grain loss is about 2%. It is not only low energy cost and high environmental protection, it also reduces the use of pesticides and improves the safety of barn pest control and consumers' food intake. In addition to the use in rice storage silos, it can also be used in imported grain storage silos such as corn and sorghum, which is more suitable for promotion and application in safe agriculture.

Image recognition system for insect pests

The technology to intelligently identify the types and quantities of insect pests through mechanical learning is now under development to provide farmers with more accurate management when the occurrence of pests population. Taking rice brown planthopper (BPH) as an example, an image recognition system for recognizing BPH is being developed at TARI in cooperation with the Industrial Technology Research Institute in order to assist controlling BPH migrated to Taiwan from neighboring countries or regions with airflow. This insect may cause more than 30% of production losses in severe cases. Moreover, the damage of BPH often occurs in the late growth stage of rice development making it difficult to control. Therefore, it is suggested to initiate pest management program when 2-3 larvae of BPH are found in a single rice plant. Unfortunately, BPH is small in size and generally difficult for farmers to identify, so that an automatic identification system is necessary to improve the efficiency and accuracy of BPH image judgment for a timely control. At present, the recognition rate can reach 90% through the deep leaning method, and can be used for the long-term dynamic monitoring. An image capturing device that to facilitate farmers' use and data uploading and an automatic identification system are now in development.

CONSTRUCTING THE EARLY WARNING AND NOTIFICTATION SYSTEM TO COPE WITH NATURAL DISASTERS

Agricultural production in Taiwan is vulnerable to meteorological disasters, such as typhoons, heavy rainfall, drought, etc. Annual crop losses due to disasters caused about 50 million NT dollar (approximately USD$1.7 million), even as high as $NT27.2 billion (USD$3 billion). Therefore, the applications of disaster prevention information and technology to reduce losses are important issues to stabilize food production. And the early warning systems are considered to have greater benefits for disaster prevention (Rogers and Tsirkunov, 2010). In 2016, the COA has implemented a four-year project, entitled “Study on the Construction of Risk Indicators for Agricultural and Forestry Meteorological Disasters and the Strategy for Disaster Adaptation.” This project puts together the efforts of research and development to reduce damages from meteorological disasters, including integrating the database, developing disaster prevention technologies and preventing disasters in major crop production areas. It is hoped to change from the passive disaster relief to turn into active prevention measures. The experimental results and outputs from the project were promoted through sixty extension activities, with a total of more than 3,000 participants.

According to the real-time meteorological information and disaster forecast provided by the Central Weather Bureau (CWB), the databases of meteorological critical conditions of crop disasters were built by the district agricultural research and extension stations and research institutions in each area and have been linked to establish the Crop Disaster Early Warning Information Platform (Fig. 6) ( http://disaster.tari.gov.tw ). Disaster prevention measures and cultivation calendars have been established for various important economic crops, including information of disaster critical conditions, damage patterns and corresponding disaster prevention technologies. With that, it can be extended to use as a basis for crop disaster warning, damage assessment and agricultural insurance. At the same time, it also provides the basic knowledge for impact assessment of climate change. In the future, crop cultivation information and farming systems will be integrated with the databases of agricultural production and meteorological resources, so that climate information can be downloaded upon request to carry out high efficiency agricultural management and to reduce the negative impact of meteorological disasters on agricultural production.

Fig. 6. Home page of the ‘Crop Disaster Early Warning Information Platform ’. ( http://disaster.tari.gov.tw ).

In addition, the development of disaster prevention standard operation procedures and technologies, when the probability of disasters reaches a certain level, is to promote farmers to take corresponding preventive measures, such as the use of internet, newsletters, APP and other media to deliver information. The APP of Crop Disaster Early Warning Information System could provide real-time disaster information of various crops and help automatically determine the severity of agrometeorological disasters.

The use of UAVs or drones has the advantages of quickly recording high mobility and high spatial resolution images and generating maps in short time to assist the monitoring and surveillance of natural disasters and post-disaster investigations, and therefore to accelerate post-disaster rehabilitation and recovery. As such, the geographic information system, image unsupervised classification, image segmentation, and digital surface model (DSM) are applied altogether in line with UAV high spatial resolution images. So far, the developed systems have been used in some crop disaster evaluation processes such as the lodge of rice and banana (Chou et al. 2018 ).

Precision agriculture is no longer just a basic data collection and analysis of field operations. In the era of ICT, it provides farmers an excellent management tool, including crop quality cultivation, pest management, field or greenhouse irrigation decision-making, and applications for disaster prevention and mitigation. It also plays an important role in a new wave of SA through intelligent machine learning or identification system development, combined with the decision-making system generated by big data analysis and intelligent auxiliary equipment operation. In the long run, as to the various environments of agricultural production and the specific targets set by various limiting factors are different, real-time and high efficiency information of plant physiology, nutrition, and environment must be optimized and incorporated for various management systems. The integration of various decision-making and management systems is also the goal of continued efforts in the future.

Chen, L. H. and C. C. Chen. 2014. Effects of light integral on the monitoring tomato irrigation schedule. Bulletin of Taichung District Agricultural Research and Extension Station 125:39-51. (in Chinese with English abstract) Chou, C. Y., S. Y. Wu, and C. L. Chen. 2018. Application of unmanned aerial vehicle (UAV) photography on agricultural post-disaster investigation – A case study on image interpretation of banana plantation damages by disasters. Journal of Photogrammetry and Remote Sensing 23:83-101. https://doi.org/10.1016/j.compag.2018.09.040 Lee, Y. J., C. M. Yang, K. W. Chang, and Y. Shen. 2008. A Simple spectral index using reflectance of 735 nm to assess nitrogen status of rice canopy. Agronomy Journal 100:205–212. https://doi.org//10.2134/agronj2007.0018 Lee, Y. J., K. W. Chang, Y. Shen, T. M. Huang, and H. L. Tsay. 2007. A handy imaging system for precision agriculture studies. International Journal of Remote Sensing 28:4867-4876. http://dx.doi.org/10.1080/01431160601075566 Lin, C. Y. and C. M. Yang, 2000. Development of key technology for precision agriculture and improvement of agricultural production technology. p.1-6. in : Studies on Precision Farming System for Rice . C. Y. Lin and C. M. Yang (eds.) Wufeng, Taichung, Taiwan. (in Chinese with English abstract) Lin, S. H., C. T. Lu, W. S. Jwo, and H. Y. Lu. 2014. Establishment and validation of prediction model for rice growth stages. Journal of Taiwan Agricultural Research 63:30-42. (in Chinese with English abstract) Shen, Y. and K. W. Chang. 2003. Classification of extent and degree of drought stressed rice by remote sensing techniques. p.57-64. in : Agricultural Climatic Disasters Survey and Protection Techniques. Shen, Y., J. C. Lo, and S. P. Cheng. 2000. Development of remote sensing techniques to identify nitrogen status of paddy rice. Chinese Journal of Agrometeorology 7:23-31.(in Chinese with English abstract) Reyns,P., B. Missotten, H. Ramon, and J. De Baerdemaeker. 2002. A review of combine sensors for precision farming. Precision Agriculture 3:169-182. https://doi.org/10.1023/A:1013823603735 Rogers, D. and V. Tsirkunov. 2010. The costs and benefits of early warning systems. in : Global assessment report on disaster risk reduction. Published by United Nations Office for Disaster Risk Reduction, Geneva, Switzerland. Wu,Y. S., Y. T. Hsu, C.T. Chen, P. J. Wu, D. H. Wu, M. H. Lai, B. J. Kuo, C. L. Chen, and C. Y. Yang. 2019. Management of paddy field irrigation using intelligent water-level monitoring devices and examining corresponding changes in physiological characteristics and yield in rice. Crop, Environment & Bioinformatics (accepted) Yang, C. M. and C. Y Lin, 2003. Rice Precision Farming System. p.1-12, Special Publication of TARI, No. 105. Wufeng, Taichung, Taiwan. (in Chinese with English abstract) Yao, M. C. and C. Y. Lee. 2017. Monitoring and management of cereal pests. Agricultural Pest Management and Food Safety Research and Development Achievements Seminar, Special Issue. 57-62. (in Chinese with English abstract)

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Redding, California - November 7, 2022

The taiwan international water week (tiww), 2022 attracts leaders from the government, industry, and research institutes, the taiwan international water week (tiww), 2022 provided an excellent and diverse platform to gather related buyers, experts, and practitioners from the global water industry to share innovative water solutions, showcase the latest technologies, and tap business opportunities..

According to Meticulous Research®, the Water and Wastewater Treatment Market is expected to reach a value of $956.48 billion by 2032, at a CAGR of 5.4% during the forecast period 2022–2032.  The growth of the water and wastewater treatment market is driven by rapid population growth and urbanization, stringent water treatment regulations, the rising need for new water resources, the growing emphasis on water quality and public health, and the increasing prevalence of waterborne diseases.

Furthermore, the growing demand for energy-efficient and advanced water treatment technologies is expected to provide significant growth opportunities for water and wastewater treatment system providers in the coming years. However, the high installation, maintenance, and operational costs are expected to hinder the growth of this market to a notable extent. In addition, the aging and deterioration of existing water infrastructure are the major challenges to the growth of the water and wastewater treatment market.

In line with the global market trends and the growing demand for water and wastewater treatment technologies, the Taiwan International Water Week (TIWW), 2022, was held from 13- 15 Oct 2022, at Taipei World Trade Centre - TWTC Taipei, Taiwan. It provided an excellent and diverse platform to gather related buyers, experts, and practitioners from the global water industry to share innovative water solutions, showcase the latest technologies, and tap business opportunities.

This exhibition received an overwhelming response from government authorities and industry leaders worldwide. Besides continuous support from Water Resources Agency (WRA) and Industrial Technology Research Institute (ITRI), relevant industry associations such as the Taiwan Environmental Manufacturers Association (TEMA) and Functional Water Association of Taiwan and distinguished industry players, including LCY Group, GSD Technologies, CTCI Corporation, Fluence Corporation, Ever Clear Environmental Engineering, Hui-Min Environment Tech, and Veolia Water Technologies (Malaysia) participated in the exhibition expand their global water business. In addition to these leaders, TIWW also attracted market research and advisory firms such as Meticulous Research®, who illustrated its market intelligence services in the water and wastewater ecosystem.

We thank you, TIWW, for providing us with a great platform to interact with the leaders in this industry. It surely ended with a huge success, and we look forward to visiting the next edition! See you at TIWW 2023!

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For more information, please visit- https://www.taiwanintlwaterweek.com/en/index.html

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Prediction of soil moisture using machine learning techniques: A case study of an IoT‑based irrigation system in a naturally ventilated polyhouse

• Challa, Lakshmi Poojitha
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• Subeesh, Anakkallan
• Srilakshmi, Mandru

The agricultural sector faces a massive challenge in enhancing food production for the growing population with limited water resources. For effective and optimum utilization of fresh water, developing smart irrigation systems based on the internet of things (IoT) is essential for scheduling irrigation based on crop water requirements. In this study, an IoT‑based irrigation system was developed and evaluated inside a greenhouse located in the experimental fields of Indian Council of Agricultural Research‑Central Institute of Agricultural Engineering (ICAR‑CIAE), Bhopal, India. Data on microenvironmental parameters such as temperature, relative humidity, light intensity, soil temperature and soil moisture were collected from the sensors developed inside the greenhouse. Soil moisture was predicted based on the field data collected via different machine learning techniques, such as the decision tree (DT), random forest (RF), multiple linear regression (MLR), extreme gradient boosting (XGB), K‑nearest neighbour (KNN) and artificial neural network (ANN) methods, with three input combinations. The ANN (coefficient of determination [R2] = 0.942, 0.939) models performed well but were found to be less effective than the RF (R2 = 0.991, 0.951) and XGB (R2 = 0.997, 0.941) models in the training and testing phases, respectively. The RF and XGB models outperformed the other models, while the MLR (R2 = 0.955, 0.875) technique underperformed. With respect to both the testing and training datasets, the models trained with all four inputs outperformed the models trained with two or three inputs.RésuméLe secteur agricole est confronté à un défi de taille en ce qui concerne l'amélioration de la production alimentaire pour une population croissante avec des ressources en eau limitées. Pour l'utilisation efficace et optimale de l'eau douce, le développement de systèmes d'irrigation intelligents basés sur l'internet des objets (IoT) est exigé pour planifier l'irrigation en fonction des besoins en eau des cultures. Dans cette étude, un système d'irrigation à base l'IoT a été développé et évalué à l'intérieur d'une serre située dans les champs expérimentaux de l'ICAR‑CIAE, à Bhopal, en Inde. Les données sur les paramètres microenvironnementaux tels que la température, l'humidité relative, l'intensité lumineuse, la température du sol et l'humidité du sol ont été recueillies à partir des capteurs développés à l'intérieur de la serre. L'humidité du sol a été prédit sur la base des données de terrain recueillies au moyen de différentes techniques d'apprentissage automatique, telles que l'arbre de décision (DT), la forêt aléatoire (RF), la régression linéaire multiple (MLR), la poussée de gradient extrême (XGB), le voisin le plus proche (KNN) et le réseau de neurones artificiels (ANN), avec trois combinaisons d'entrée. Les modèles ANN (R2 = 0,942, 0,939) ont donné de bons résultats, mais se sont avérés moins efficaces que les modèles RF (R2 = 0,991, 0,951) et XGB (R2 = 0,997, 0,941) dans les phases de formation et d'essai, respectivement. Les modèles RF et XGB ont surpassé les autres modèles, tandis que la technique MLR (R2 = 0,955, 0,875) a été moins performante. En ce qui concerne les ensembles de données d'essais et de formation, les modèles formés avec les quatre entrées ont surpassé les modèles formés avec deux ou trois entrées.

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Chondroitin sulfate ameliorates hypertension in male offspring rat born to mothers fed an adenine diet.

1. Introduction

2. materials and methods, 2.1. animal experiments, 2.2. h 2 s-generating enzymes, 2.3. no parameters, 2.4. plasma short chain fatty acids (scfas), 2.5. 16s rrna gene sequencing and analysis of gut microbiota composition, 2.6. statistics, 3.1. offspring outcomes, 3.2. h 2 s pathway, 3.3. no pathway, 3.4. differences in microbiota composition, 4. discussion, 5. conclusions, author contributions, institutional review board statement, informed consent statement, data availability statement, acknowledgments, conflicts of interest.

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Tain, Y.-L.; Hou, C.-Y.; Chang-Chien, G.-P.; Lin, S.-F.; Hsu, C.-N. Chondroitin Sulfate Ameliorates Hypertension in Male Offspring Rat Born to Mothers Fed an Adenine Diet. Antioxidants 2024 , 13 , 944. https://doi.org/10.3390/antiox13080944

Tain Y-L, Hou C-Y, Chang-Chien G-P, Lin S-F, Hsu C-N. Chondroitin Sulfate Ameliorates Hypertension in Male Offspring Rat Born to Mothers Fed an Adenine Diet. Antioxidants . 2024; 13(8):944. https://doi.org/10.3390/antiox13080944

Tain, You-Lin, Chih-Yao Hou, Guo-Ping Chang-Chien, Shu-Fen Lin, and Chien-Ning Hsu. 2024. "Chondroitin Sulfate Ameliorates Hypertension in Male Offspring Rat Born to Mothers Fed an Adenine Diet" Antioxidants 13, no. 8: 944. https://doi.org/10.3390/antiox13080944

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