高浓度多菌灵自然状态植物残留研究

目的]探讨高浓度多菌灵在自然条件下的残留动态及降解规律。方法]通过选取质量分数为0.2%（推荐浓度）、0.4%（2倍浓度）、1.0%（5倍浓度）多菌灵溶液在植物叶片上喷洒,测定自然状态下多菌灵的残留量,并研究了3种浓度下多菌灵残留量的动态模型。结果]推荐浓度下多菌灵降解符合降解动力学规律,而2倍和5倍浓度下的样本降解动力学模型出现了异化。分析认为,多菌灵的植物残留量受植物吸收能力和气候条件的双重影响：吸收能力受施用浓度和植物生长状态的影响,较高浓度施用和植物处于缓慢生长期时,不利于多菌灵的吸收;气候条件主要受温度和湿度的影响,温度较高和干燥的气候条件不利于多菌灵的降解。结论]为指导农业生产中农作物的不同生长阶段、不同气候条件下多菌灵的施用提供了理论依据。

Residues of High Concentration Carbendazim on Plants in Natural State

Objective] The paper was to explore the residual dynamics and degradation rule of high concentration carbendazim in natural condition.Method] The carbendazim solutions with mass fractions of 0.2%(recommended concentration),0.4%(2 times of the recommended concentration) and 1.0%(5 times of the recommended concentration) were sprayed on plant leaves,and the residual amount of carbendazim in natural condition was determined.The dynamic models of carbendazim residues under 3 concentrations were also studied.Result] The degradation of carbendazim under recommended concentration was accorded with Kinetic model for degradation,but the degradation Kinetic model for samples under 2 times and 5 times concentration appeared dissimilation.The residue of carbendazim on plant was affected by up-taking capacity of plants and weather conditions.The up-taking capacity was affected by application concentration and growth condition of plant,higher concentration application and slow growth stage of plant were not conducive to the absorption of carbendazim;weather condition was mainly referred to temperature and humidity,higher temperature and dry weather were not conducive to the degradation of carbendazim.Conclusion] The paper provided theoretical basis for guiding the application of carbendazim under different growth stages of crops and different weather conditions in agricultural production.