Irrigated Paddy Fields Research Articles

Modulation of irrigation-induced microbial nitrogen‑iron redox to per- and polyfluoroalkyl substances' water-soil interface release in paddy fields: Activation or immobilization?

Understanding the modulation of paddy field irrigation to the migration of per- and polyfluoroalkyl substances (PFAS) at the water-soil interface is pivotal for the management of PFAS pollution in paddy soil and surrounding surface water environments. In flooded soils, soil organic matter was transformed into aromatic protein-like dissolved organic matter (DOM). Meanwhile, Na+, K+, and Mg2+ were translocated into extracellular polymeric substances (EPS) under the catalysis of cation channel enzymes (p < 0.05), provided ion bridging for the binding of DOM and PFAS, and accelerated the accumulation of C4–C9 PFAS in overlying water (41.79–99.14 %). Short-chain PFAS's accumulation in soil solution of drought soils was stimulated by microorganisms secreting soluble microbial by-product-like DOM (53.15–97.96 %). Furthermore, PFAS's distribution in flood soils was dominated by bacterial denitrification and iron-reduction, whereas iron-oxidation and ammoxidation controlled that in drought soils. The transformation of organic carbon including CO and COC caused by irrigation-induced redox modulated PFAS cross-media translocation. Iron‑nitrogen redox in flooded paddy soils immobilized the PFAS's migration into overlying water (p < 0.05). Our findings have profound implications for PFAS's pollution control, surface water environmental protection, and rice production security in paddy fields.

Real-Time Paddy Field Irrigation Using Feature Extraction and Federated Learning Strategy

Real-Time Paddy Field Irrigation Using Feature Extraction and Federated Learning Strategy

Effects of GroMore® Program on Rice Yield and GHG Emissions in a Korean Paddy Rice

The agronomic benefits of pesticides combined with amino acid application to increase rice production have been recognized, but they are still not well-known for greenhouse gas (GHG) emissions and mitigation in irrigated paddy fields. Thus, this study was conducted to investigate the combined effects of pesticide and amino acid application on rice yield and methane (CH4) emissions in a Korean rice paddy. A field experiment was conducted with five levels: none (no pesticide application, T1), different conventional practices (combined application of insecticides and fungicide, T2 and T3), and GroMore® programs (combined application of insecticides, fungicides, and amino acids, T4 and T5). Rice grain yield and yield components were obtained using agronomic measurements. To determine the greenhouse gas intensity (GHGI) of each treatment, CH4 emissions were measured throughout the rice growing period. Results showed that the chemical applications in combination with amino acids in T4 obtained a higher grain yield and number of panicles per plant compared to T1, T2, and T3, while T4 and T5 showed no difference on filled spikelets except for T2. T3 and T5 showed lower respective cumulative CH4 emissions by 30% and 32% during the entire rice growing season, compared to no chemical application (T1). Meanwhile, N2O emissions were negligible in all treatments because the paddy field was flooded most of the growing season. The results of the impact of GroMore® programs on relatively higher grain yield and lower GHG emissions are presented. In conclusion, the application of pesticides combined with amino acids obtained lower GHGI values.

Feasibility Analysis of Inpari IR Nutri Zinc Rice Seed Farming in Irrigated Paddy Fields in Riau Province

Feasibility Analysis of Inpari IR Nutri Zinc Rice Seed Farming in Irrigated Paddy Fields in Riau Province

Assessment of Increasing Rice Plant Index 400 with the Application of Environmentally Friendly Rice Cultivation Technology in Irrigation Land, Banjar City, West Java

Abstract Achieving rice self-sufficiency is the main target of the Ministry of Agriculture in order to meet the demand for rice consumption which continues to increase every year. Various efforts have been made, including through a program to increase the Rice Planting Index (PI) from 300 to 400 or from three times to four times in one year. The research aim was to determine the technical and financial feasibility of increasing PI Paddy 400 by applying Environmentally Friendly Rice Cultivation (EFRC) technology to irrigated paddy fields. The study was carried out in an irrigated paddy field in Pataruman Village, Pataruman District, Banjar City, West Java Province, Indonesia. The study used an adaptive research approach on 2.0 ha of farmers’ land involving 12 implementing farmers (cooperators). The assessment will be carried out in 2021, starting from the 2nd Planting Season (PS) to the 4th PS, while the 1st PS activities have been carried out by farmers. The technology adapted is the early maturing New Superior Varieties (NSV) Cakrabuana and M70D as well as setting cropping patterns and implementing EFRC technology packages. The results of the study show that the use of NSV Cakrabuana and M70D can speed up harvest time, so that they can harvest four times in one year. EFRC technology can increase rice production for one year by 24.24% from 16.5 to 20.5 tons of dry harvested grain (DHG). Farmers are still hesitant to develop PI 400 rice technology even though it is financially profitable and feasible with an RC Ratio of 1.84.

Study of Optimizing Swamp Lands in the Context of Socio-Economic Empowerment of Communities in Barito Kuala Regency, South Kalimantan

Abstract Optimizing agricultural swamp land had a positive impact on the socio-economic empowerment of the community in Barito Kuala Regency, South Kalimantan. The research was conducted from March to November 2022. This research was a descriptive study, that used the method of collecting data using an investigative survey. Data analysis carried out investigations of sharecroppers, mapping and situation surveys, surveys of land use conditions, and investigations of land tenure status. The results of the study stated that the impact of the Swamp Land Optimization program on Community Socio-Economic Empowerment, namely contributing to farmers having their rice farming land area, strengthening the structure of farmers’ income sourced from on-farm activities, and farmers being able to meet their own needs. Some of the obstacles that were still experienced by farmers are the lack of water sources to irrigate paddy fields, the condition of damaged road infrastructure, low production yields, infertile agricultural land, pests and plant diseases, and others. Advice for policymakers is to maintain the sustainability of swampland optimization activities because it provides optimal assistance to farmers in rice farming in swampland.

Alternative Agronomic Management Practices Through Fertilizer, Irrigation, and Plant Density Adjustments for Hybrid Fodder Sorghum (&lt;em&gt;Sorghum bicolor&lt;/em&gt; L. Moench)

Purpose: The basal fertilizer recommendation for growing hybrid fodder sorghum varieties in uplands involves relatively high quantities of Urea, TSP, and MOP, with rates of 100:90:65 kg/ha for SX-17 and 150:62:37 kg/ha for Dairy green. For both initial and ratoon crops, it is recommended to apply 150 kg/ha of urea as a top dressing. This study investigated the impact of reducing the fertilizer application rate to 75% and employing alternative agronomic practices on hybrid fodder sorghum varieties grown in lowland fallow paddy fields in the dry zone during the Yala and third seasons.Research Method: The agronomic management practices, including four basal fertilizer rates (Urea:TSP: MOP) of 100:90:65 (BD1), 150:62:37 (BD2), 75:68:49 (BD3), and 113:47:28 (BD4); two top-dressing urea fertilizer rates of 150 (TD1) and 112.5 kg/ha (TD2); two plant spacing configurations of 45x30 (WS) and 45x15 cm (NS); and two irrigation interval regimes, 5 days up to 30 days followed by 8 days (SI) and 7 days up to 30 days followed by 10 days (LI) were investigated. These factors were combined into four agronomic management packages: AMP1 (BD1, TD1, WS, SI), AMP2 (BD2, TD1, NS, SI), AMP3 (BD3, TD2, WS, LI), and AMP4 (BD4, TD2, NS, LI). The study used a split-plot design with three replicates and assessed various parameters, including plant height, stem diameter, plant weight, leaf area index (LAI), number of tillers, and fodder yield in both the initial fodder sorghum crop and the first ratoon crop. The crops were harvested when 50% of the panicles on the plants were at the milk and dough grain stages.Findings: The initial crop exhibited significantly heavier plants having wider stems when grown with higher fertilizer rates, wider plant spacing, and shorter irrigation intervals in AMP1. Irrespective of fertilizer rate and irrigation interval, the initial crops tended to have higher LAI with narrow plant spacing in AMP2 and AMP4. In the ratoon crops, wider plant spacing in AMP1 and AMP3 resulted in clumps with a greater number of tillers and heavier plants. However, the ratoon crops also exhibited higher LAI with narrow plant spacing in AMP2 and AMP4. Total fodder dry matter yield (DMY) in AMP2 and AMP4 with narrow plant spacing was significantly greater for both varieties. Furthermore, the DMY was not affected by fertilizer rate and irrigation interval.Value: Hybrid fodder sorghum varieties (SX-17 and Dairygreen) cultivated at higher plant density, along with reduced fertilizer (75%) and irrigation, can produce comparable fodder yield (21.1 and 26.1 MT/ha, respectively) to those grown at lower plant density with more fertilizer and irrigation (24.6 and 28.1 MT/ha, respectively) in lowland paddy fields during Yala and third seasons in the dry zone.

Analysis of The Implementation of Sustainable Food Agricultural Land Protection Policy in Bandung District: A Case Study of Rice Field Conversion in Cikancung District

The policy of sustainable protection of agricultural land becomes crucial in addressing land degradation and land use conversion, especially from agriculture to non-agriculture, alongside the increasing demand for land due to population growth and economic development, which can lead to negative impacts such as a decrease in food security, marginalization of agricultural land, and an increase in flood risks. This research aims to analyze the implementation of the Sustainable Protection of Food Agricultural Land Policy, understand the rate of paddy field conversion, and identify trends in land conversion after the policy's enforcement. This study employs a qualitative approach, with data obtained through interviews, observations, and documentary studies. The research is conducted in Bandung Regency, with samples taken from Cikancung Sub-district, Bandung Regency, West Java Province. Informants involved in this research are selected through judgment sampling and are individuals related to the sustainable protection of agricultural land policy and relevant stakeholders. Data analysis is conducted using qualitative and spatial analysis. The research findings indicate that the implementation of sustainable agricultural land protection policy in Bandung Regency is still in the socialization and planning stages. Based on spatial analysis, the implementation of the policy in Cikancung Sub-district has led to the conversion of paddy fields, particularly in non-technical irrigation paddy fields, predominantly converted into industrial land. This conversion covers a total area of 20.3 hectares, with the most significant change occurring in non-technical irrigation paddy fields converted into industries, covering an area of 13.7 hectares. Based on internal, external, and policy analysis, it can be concluded that the policy implementation in Cikancung Sub-district has not been optimal in addressing the conversion of paddy fields.

Application of Sentinel-2A Images for Land Cover Classification Using NDVI in Jember Regency

The advancement of remote sensing technology has led to the development of sophisticated image processing methods that yield highly accurate land cover classification information, minimizing misinterpretations. The Normalized Difference Vegetation Index (NDVI) is a widely utilized method in remote sensing for measuring green vegetation. A significant portion of the Jember Regency area is covered by vegetation. This study aimed to identify various land cover types in the Jember Regency area, quantify the area for each classification, and establish the NDVI value ranges for each type of cover. Sentinel-2 was employed as the primary data source, and the NDVI method was utilized for land cover classification in the Jember Regency. The region exhibited diverse land cover types. Data from Sentinel-2A captured in June and October 2019 were chosen due to their accessibility, open-source nature, and adequate spectral, spatial, and temporal resolution. The classification in this study encompassed five classes: water bodies, settlements, dry fields, irrigated paddy fields, and forests. Error analysis was conducted using a confusion matrix with the Overall and Kappa algorithms. The accuracy results for June indicated a Kappa Accuracy of 37.7% and Overall Accuracy of 54.5%. In October, the Kappa Accuracy increased to 39.9%, and the Overall Accuracy reached 56.5%. In conclusion, the NDVI method did not meet the criteria for accurately interpreting land cover classification.

Nitrogen Loss and Migration in Rice Fields under Different Water and Fertilizer Modes.

Irrigating aquaculture wastewater in appropriate irrigation and drainage modes in paddy fields could reduce water and fertilizer loss. However, the precise mechanisms involved in the degradation and movement of nitrogen in various water and fertilizer modes are still not fully understood. This study involves conducting a controlled experiment using barrels to examine the effects of various water quality, irrigation and drainage methods, and fertilization levels. The aim is to analyze the patterns of nitrogen degradation, loss, migration, and absorption in surface water, underground drainage, and soil leakage at different depths. The results showed the following: (1) The paddy field has a significant purification effect on aquaculture wastewater after one day of irrigation, reached at 78.55-96.06%. (2) Aquaculture wastewater irrigation increased nitrogen concentration in the plough layer, which helps rice roots absorb nitrogen and boosts plant TN. (3) In special dry years, underground seepage is the predominant method of nitrogen loss, and underground drainage nitrogen concentration peaks 2-6 days after fertilization. (4) Under aquaculture wastewater irrigation, the TN loss load of II decreased by 27.65-42.45% than FSI. Compared with IA-80, the TN degradation rate of IA in surface water increased by 18.51%, TN loss load decreased by 5.48%, TN absorption rate significantly increased by 14.61%, and yield increased by 31.14% significantly. IA is recommended in special dry years, which can improve the TN absorption rate and ensure high yield while significantly reducing the loss load of nitrogen. The findings can provide a basis for the purification of aquaculture wastewater through paddy field ecosystems in response to fertilizer supply levels.

Yield gap variation in rice cultivation in Indonesia

Abstract The rice yield gap (YG) is a global concern, requiring more detailed studies spatially and temporally. As a staple food in Indonesia, rice was produced from 7.4 Mha paddy fields in 2019. Better insight into the YG helps assess measures to boost rice production. However, the information on YG variation among regions scale is limited. This study aimed to identify the rice YG based on 295 historical trial datasets from 23 provinces in Indonesia. We surveyed published trial results from 2012 to 2022 and analyzed YGs, expressed as the percentage of farmer yield (FY). The potential yield (PY) was estimated from field trial results using introduced rice cultivation technology package, whereas FY from results using existing farmer practices. Our study showed that the average YG was 62% in rainfed, 54% in tidal, and 32% in irrigated paddy fields. The YG was significantly high in the paddy fields of Kalimantan (74%) and Maluku-Papua (49%), while the lowest was in Sulawesi (27%) and Java (31%). The YG varied significantly with geo-regions, rice varieties, and cultivation technology packages. Closing the YG and ensuring sustainable rice production requires the implementation of sustainable intensification through applying site-specific technology packages, reallocation of agricultural interventions to a higher YG region, and rice variety improvement to increase PY.

Analisis Indeks Kualitas Tanah pada Tipe Penggunaan Lahan Berbeda di Kecamatan Maginti

Soil quality is the ability of the soil to function to maintain plant productivity, maintain and maintain water availability and support human activities. The purpose of this study was to determine the Soil Quality Index (SQI) and determine the management direction for improving soil quality on different land uses in the Maginti sub-district. A field study and laboratory analysis were carried out from March to May 2022. The method used in this study was a free survey method through field observations conducted on 2 types of land use, namely irrigated rice fields and dry land. In irrigated rice fields, 3 sample points were taken and 3 sample points in dry land, then composited into 1 sample in order to represent the total amount of each land use. In calculating the value of the soil quality index using the formula by Bajracharya (2006) which has been modified by Ghimire (2018). The soil quality index is analyzed using the indicators that best represent soil functions. The variables observed included Texture, pH, C-Organic, N-Total, P-Available and K-Available. Soil quality index values range from 0-1, the higher the index value, the better the quality. The results of the analysis of the selected soil functions (minimum data set/MDS) and the MDS scoring were summed to determine the value of the soil quality index (SQI). The conclusion of this research is that the criteria for medium soil quality are irrigated rice fields with SQI (0,56) and dry land with low criteria with SQI (0,36). To improve soil quality in irrigated paddy fields and dry lands is to increase organic matter through the application of organic fertilizers with the right dosage according to the type and level of soil fertility.Keywords: Soil Quality Index, Irrigated Rice Fields, Non-Irrigation, Soil Management, Physical Properties of Soil Chemistry.

Flood irrigation increases the release of phosphorus from aquifer sediments into groundwater

Nonpoint source pollution caused by agricultural activities has long attracted widespread attention from people in society and academia. Many studies have found that human activities not only convey exogenous pollutants into aquifers but also affect the mobilization and transport of geogenic pollutants in aquifers. Geogenic groundwater with high phosphorus concentrations has been found, but it is unclear whether the changes in hydrogeochemical conditions caused by flood irrigation in paddy fields affect the fate of phosphorus. We investigated the temporal and spatial distribution characteristics of phosphorus in groundwater under the influence of flood irrigation through laboratory experiments, proved its impact on phosphorus in groundwater, and explored the mechanisms influencing P concentrations. The results show that flood irrigation can increase the release of phosphorus in the aquifer media and greatly increase the phosphorus concentration in the groundwater of the study area, which has a negative impact on groundwater quality. The main mechanism of increase in phosphorus concentration in groundwater involves an increase in the reducibility of the aquifer via flood irrigation; as a result, iron oxides are reductively dissolved and iron-bound phosphorus is released into the groundwater. Changes in pH also result in the dissolution of calcium phosphate minerals and the release calcium-bound phosphorus. This study not only advances the theory of multielement-coupled hydrogeochemistry but also provides a reference for agricultural planning and groundwater pollution prevention and control in rice-growing areas.

Higher rice yield and lower greenhouse gas emissions with cattle manure amendment is achieved by alternate wetting and drying

ABSTRACT Climate change and water scarcity threaten the sustainability of rice production systems. Alternate wetting and drying (AWD) is a promising option to reduce methane (CH4) emission from irrigated paddy fields. However, its effect on rice yield remains to be clarified. Organic amendment can increase rice yield but may also increase CH4 emission. We therefore hypothesized that the combination of AWD with organic amendment could both increase rice yield and decrease CH4 emission. We carried out field experiments in six consecutive rice seasons during 2019 − 2022 in Central Java, Indonesia. We examined the effect of water management (continuous flooding [CF] and AWD) with (+M) and without (−M) the amendment of cattle manure as a locally available organic matter on rice growth and yield and the emissions of CH4 and nitrous oxide (N2O). AWD significantly (p < 0.05) decreased CH4 emission by 29% but marginally (p < 0.1) increased N2O emission by 10% relative to CF. There was no significant effect of AWD alone on rice yield. AWD significantly increased water productivity (the ratio of rice yield to irrigated water volume) by 50%. Cattle manure amendment significantly increased CH4 emission by 12% and rice yield by 5% but did not affect N2O emission. The combination effect of AWD+M relative to CF−M (control) was additive and resulted in a 7% increase in rice yield, a 19% decrease in the global warming potential (GWP) of CH4 + N2O emissions during both growing and fallow periods, and a 24% decrease in yield-scaled GWP. Our results indicated that the combination of AWD with cattle manure amendment would be a promising means to increase rice yield while reducing total soil greenhouse gas emission from irrigated rice paddies.

Economic and Operational Evaluation of the Use of Two Manual Rotary and Cono Weeders in an Intensive Rice Cultivation System (SRI) in the Central Zone of Burkina Faso

Rice, the Burkina Faso's fourth most important cereal in terms of surface area, production and annual per capita consumption, is a staple food. The high demand for rice is far from being met by national production. Several constraints, including weeds, are causing huge yield losses. The aim of this study is to assess the economic impact of innovative mechanical weed management technologies, with a view to increasing the productivity of irrigated rice in Burkina Faso. The Boulbi irrigated paddy field was used for experimentation. The evaluation was carried out on the farm using a completely randomized Fisher block design in a 4-repeat SRI. The performance of three weeders, two designed (rotary (T2) and cono (T3)), was evaluated with the Africa Rice model (T1), compared with weeding with a hand hoe (T0). Data were collected on performance and yield parameters. They were recorded with XLSTAT Version 2016.02.27444 and subjected to descriptive analyses. Results showed that weeding with weeders reduced labor time for the three weeding operations by 55% with T1, 65% with T2 and 70% with T3 compared with T0. The yield increase was 37.20% with T3, 32% with T2 and 22% with T1 compared with T0. The operating account results show additional gains of 386,250 FCFA with T3, 319,417.8 FCFA with T2 and 223,583.9 FCFA with T1 compared to T0.

Impact of biochar on the antibiotic resistome and associated microbial functions in rhizosphere and bulk soil in water-saving and flooding irrigated paddy fields

The addition of biochar in paddies under the condition of water-saving irrigation can simultaneously achieve soil improvement and water conservation, but little is known about the role of these two regulations in mediating the fate of antibiotic resistome in paddy soils. Here, metagenomic analysis was conducted to investigate the effects and intrinsic mechanisms of biochar application and irrigation patterns on propagation of antibiotic resistance genes (ARGs) in paddy soils. The addition of biochar in paddy soil resulted in a reduction of approximately 1.32%–8.01% in the total absolute abundance of ARGs and 0.60%–22.09% in the numbers of ARG subtype. Compared with flooding irrigation, the numbers of detected ARG subtype were reduced by 1.60%–22.90%, but the total absolute abundance of ARGs increased by 0.06%–5.79% in water-saving irrigation paddy soils. Moreover, the combined treatments of flooding irrigation and biochar could significantly reduce the abundance of ARGs in paddy soils. The incremental antibiotic resistance in soil induced by water-saving irrigation was likewise mitigated by the addition of biochar. Correlation analyses indicated that, the differences in soil physicochemical properties under biochar addition or irrigation treatments contributed to the corresponding changes in the abundance of ARGs. Moreover, the variations of microbial community diversity, multidrug efflux abundance and transport system-related genes in paddy soil were also important for mediating the corresponding differences in the abundance of ARGs under the conditions of biochar addition or irrigation treatments. The findings of this study demonstrated the effectiveness of biochar application in mitigating antibiotic resistance in paddy soils. However, it also highlighted a potential concern relating to the elevated antibiotic resistance associated with water-saving irrigation in paddy fields. Consequently, these results contribute to a deeper comprehension of the environmental risks posed by ARGs in paddy soils.

Agronomic performance, yield and seed production of some new superior varieties using integrated crop management approach in tabanan district, Bali province

One of the obstacles to increasing rice productivity in paddy fields in Tabanan district is the availability of adaptive new superior varieties (NSV) with high productivity. The aim of the study was to determine the agronomic performance, yield components and seed production of three NSV lowland rice which have the potential to be developed in irrigated paddy fields at Subak Guama Tabanan districs, in collaboration with AIAT Bali as NSV seed providers. The study was conducted from February to June 2021. The study used a randomized block design (RBD) with 1 factor 4 treatments including Ciherang as a comparison and each treatment was repeated 6 times. The collected data were analyzed using analysis of variance (ANOVA), then the treatment was further tested using the Tukey test at 95%. The results of the study showed that the application with a 2:1 legowo cropping system can increase the performance and components of crop yields. The use of NSV and the 2:1 legowo planting method can increase productivity by an average of 1.24 tonnes/ha of harvested dry grain (HDG) or an increase of 19.36% tonnes/ha of HDG. The application of ICM using NSV, the legowo 2:1 planting method is one way to increase rice production.

Utilization of semi-intensive irrigated paddy fields and increasing farmers income on cropping patterns in support of ip400 technology in Central Sulawesi

Based on the agro-ecosystem and suitability of paddy fields, rice fields have high potential and opportunities to be developed in Central Sulawesi Province, but sometimes the yield is still below the average production. This research has been conducted from May 2021 to June 2022. The research location is Kaleke Village, West Dolo District, Sigi Regency, Central Sulawesi. This study aims to increase the Crop Index and harvested area to increase the production and income of farmers as well as the performance of farmer groups. Research on cropping patterns and alternation of varieties with Rice – Corn – Corn – Rice Cropping Patterns. The treatment area of 1 ha with the planting system used is: for each commodity using components, PTT Paddy rice PTT corn. While the feasibility of farming with an income analysis approach with an R/C ratio. The results showed that: (a) The design of agricultural technology innovations to increase the cropping index of rice crops with MT I results showed the production component of the Inpari 33 variety of rice tiles. R/C Ratio 2.11, on MT. II Jakarin variety corn with a yield of 5.0 tons/ha. R/C Ratio: 2.04, maize variety Sukmaraga MT.III average yield 6.3 tons with R/C Ratio: 2.01 and MT. IV rice variety Inpari 36 with a yield of 5 tons/ha GKP R/C Ratio: 1.59(c) Increasing the Crop Index and harvested area can increase farmers’ income and the performance of farmer groups on technology supporting IP400.

Design Water Turbine as Pump Drive for Irrigating Paddy Fields in the Highlands in the Panjalu Ciamis Region

In electrical systems, safety is the main factor, but it is often overlooked because it is quite expensive. The current conventional outlet, although it has been standardized by the Indonesian national standard, is a fact in the field that there are still many incidents of electric shock, because the voltage continues to flow through the copper terminals inside the plastic frame protector. This incident can occur because the terminal is plugged into a conducting object such as a fork, spoon, iron rod, or held directly with a finger. For this reason, in this study, a safety system is made that uses the main component of the Relay as an intermediary for DC voltage and AC voltage. Trials carried out 50 times on each socket box resulted in solving the problem by conditioning the plug that had not been plugged into the terminal so that there was no voltage flowing into the outlet, this certainly distinguishes safety from using an ELCB which must have contact with the human body first.

Identification of Water Layer Presence in Paddy Fields Using UAV-Based Visible and Thermal Infrared Imagery

The accurate identification of the water layer condition of paddy fields is a prerequisite for precise water management of paddy fields, which is important for the water-saving irrigation of rice. Until now, the study of unmanned aerial vehicle (UAV) remote sensing data to monitor the moisture condition of field crops has mostly focused on dry crops, and research on the water status of paddy fields has been relatively limited. In this study, visible and thermal infrared images of paddy fields at key growth stages were acquired using a UAV remote sensing platform, and three model input variables were constructed by extracting the color features and temperature features of each field, while K-nearest neighbor (KNN), support vector machine (SVM), random forest (RF), and logistic regression (LR) analysis methods were applied to establish a model for identifying the water layer presence in paddy fields. The results showed that KNN, SVM, and RF performed well in recognizing the presence of water layers in paddy fields; KNN had the best recognition accuracy (89.29%) via algorithm comparison and parameter preference. In terms of model input variables, using multisource remote sensing data led to better results than using thermal or visible images alone, and thermal data was more effective than visible data for identifying the water layer status of rice fields. This study provides a new paradigm for monitoring the water status of rice fields, which will be key to the precision irrigation of paddy fields in large regions in the future.