Important factors affecting the safety of edible agricultural products when pesticide residues are contaminated. Pesticide residue pollution is extremely serious. This paper takes cucumber as the research object and analyzes the process control technology of pesticide application in cucumber production.
Firstly, the status quo of pesticide control in domestic cucumber production was investigated. The two existing systems of cucumber pesticide hazard control in China were comprehensively analyzed. The deficiencies in the production of pollution-free cucumber and green food cucumber production systematically investigated the status of pesticide control in typical farmers in China. And the safety status of pesticides in Beijing and Shandong. The main problems in the process control system of pesticide application in China are: the pesticide control measures in the production environment are weak; the gap between pesticide safety technical indicators and actual production is large, the use is not standardized, and the application safety risk is large. The standard limit value of pesticides and the number of detection methods are too small, lack of effective process supervision measures; the structure of pesticides is unreasonable. Soil and cucumber samples from Beijing and Shandong are collected, and carbendazim and thiophanate residues are monitored. The pollution is widespread. The total amount of the two pesticide residues is up to 1.982mg/kg in the soil and up to 0.696mg/kg in the cucumber.
Secondly, the pesticide risk index evaluation technology was established. Based on the scientific data, the pesticide concentration prediction and risk index evaluation model of cucumber production field was established. The pesticide was applied by using the formulas of pesticide adsorption equation and pesticide first-order kinetic degradation equation. The basic physical and chemical parameters predicted the concentration of pesticides in the environment and plants. The results showed that 29 pesticides such as copper hydroxide had higher residual concentrations in the soil after application, exceeding 0.01 mg/kg; 8 pesticides such as thiamethoxam The concentration of leakage is higher than 0.1Î¼g/L. Combined with the toxicological parameters of pesticides on environmental organisms and humans, the ecological risk of pesticides, human health and safety risks and actual risks under registered dosages are evaluated. Overall The actual risk of various insecticides is relatively high. The risk index of avermectin, beta-cypermethrin, chlorpyrifos and isoprocarb is in the range of 50-500. Among the fungicides, copper sulfate, sodium sulfonate, mancozeb, etc. The pesticide risk index was greater than 1.0. Among the pesticides applied in the soil, the risk index of methicillin and pentachloronitrobenzene was 3.496 and 4.962 respectively. Compared with the actual test results, the pesticide risk index evaluation model was used.
Third, the pesticide safety technical indicators were set. Based on the risk assessment, the technical index system for pesticide application process control in cucumber production was established. According to the environmental and health risk index, high-risk pharmaceuticals were excluded, and the existing registration components were selected. 31 kinds of pesticides with less risk such as enoylmorpholine and ether oxystrobin. Combined with evaluation of drug efficacy, enoylmorpholine, cymoxanil, carbendazim, chlorothalonil, flusilazole, and oxystrobin were established. 12 kinds of pesticides such as thiram, acetamiprid, imidacloprid, cypermethrin, anti-carboside and chlorfenapyr are used to control target pests and diseases, cucumber downy mildew, gray mold, powdery mildew, wilt, aphids, whitefly, and loess Technical recommendations for safe use of flies, single dose, number of seasons in the growing season, pre-harvest interval and maximum residue limit. Gas chromatographic analysis of dimethomorph and gel permeation chromatography / reversed-phase high performance liquid chromatography for the analysis of cream urea The technology of cyanide is the research focus, and the supporting methods for the above 12 pesticides in cucumber are established. The standard operating procedure SOP of the eight stages of pesticide use in cucumber production is established, and the regional planning and production base are proposed. Promote retail investors, establish a pesticide use certification and record system, and establish a four-in-one pesticide application process control and supervision mechanism.
Â Â Â Fourthly, the framework of pesticide application process control system in cucumber production in China was constructed. The harm analysis of pesticide control process in cucumber production in China was carried out, aiming at organophosphorus, organochlorine and other insecticides, carbendazim, mancozeb, and different The main hazard factors such as urea and other traditional fungicides have established that the environmental selection, soil treatment, greenhouse disinfection and pest control of pollution-free cucumbers are the four key links that cause pesticide damage. On this basis, combined with the application of pesticides in the United States. The advanced experience of the process control system, the construction of pesticide production process in cucumber production based on integrated crop and pest management module Integrated Cucumber and Pest Management: Module, ICPMM; Pesticide Control Module for Cucumber Production and Monitoring Control technology framework. ICPMM starts from crop management and integrated pest management, with reference to pollution-free cucumber production technology, supported by more detailed technical operations, and established a specific program for pest control. PCM integrated production environment, pesticide selection, safety of use Research on indicators, maximum residue limits, detection techniques, and monitoring mechanisms 2. Research, set the processing rules, constitute the framework of pesticide use process control technology.
Â Â Â This study provides technical support for the application process control of pesticides in cucumber production, and provides a model for the application of process control technology for pesticides, which is of great significance for the development of quality and safety disciplines of agricultural products.
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