[ Objective] The paper was to explore the residual dynamics and degradation rule of high concentration carbendazim in natural condition. [ Method J The earbendasim solutions with mass fractions of 0.2% （ recommended concentration）, 0.4% （2 times of the recommended concentration） and I. 0% （5 times of the recommended concentration） were sprayed on plant leaves, and the residual amount of earbendazim in natural condition was determined. The dynamic models of carbendazim residues Under 3 concentrations were also studied. [ Result~ The degradation of earbcndazim 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 carben- dazim on plant was affected by absorption capacity of plants and weather conditions. The absorption capacity was affected by application concentration and growth condition of plant, higher concentration application and slow growth stage of p]ant 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 earbendazim. [Condusion ] The paper provided theoretical basis for guiding the application of carbendazim under different growth stages of crops and different weather conditions in agricultural production.
[Objective] The research aimed to investigate the influences of each factor in the combination of Ca（ClO）2 and O3 on removing carbendazim residues from kumquat. [Method] By using Box-Behnken response surface methodology （RSM）, the effects of initial concentration of carbendazim, soaked time of Ca（ClO）2 solution, soaked time of ozone water and Ca（ClO）2 concentration on removing carbendazim residues from kumquat were studied. [Result] In the test range, the effects of each factor on removing carbendazim residues from kumquat were soaked time of ozone water, soaked time of Ca（ClO）2 solution, initial residual amount of carbendazim and concentration of Ca（ClO）2 solution in turn. By fitting the experimental result, the quadratic polynomial model of relationship between residual amount of carbendazim and the above each factor was obtained. The verified experimental result showed that the model had high precision. [Conclusion] The model could be used to guide using the appropriate soaked time of Ca（ClO）2 solution, soaked time of ozone water and Ca（ClO）2 concentration under the certain initial concentration and residue limits of carbendazim, which guaranteed obtaining the expected residue limits of carbendazim.
