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[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。
[Objective] The research aimed to investigate the residual dynamics and degradation of high concentration carbendazim under natural conditions. [Method] The carbendazim residue was sprayed on the leaves of plants by the mass fraction of 0.2% (recommended concentration) and 0.4% (2 times concentration) of 1.0% (5 times concentration) The dynamic model of carbendazim residues at three concentrations was studied. [Result] Carbendazim degradation was in accordance with the law of degradation kinetics at the recommended concentration, while the degradation kinetics model at 2 and 5 times of concentration appeared alienation. The analysis shows that the carbendazim plant residues are affected by plant absorption capacity and climatic conditions: the absorption capacity is affected by the application concentration and the plant growth state. When the plant is in a slow growth period, the application of the carbendazim is disadvantageous to the carbendazim Of the absorption; climatic conditions are mainly affected by temperature and humidity, high temperature and dry weather conditions detrimental to the degradation of carbendazim. [Conclusion] The study provided the theoretical basis for guiding the application of carbendazim at different growth stages of agricultural production and in different climatic conditions.