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土壤圈(英文版). 1997, (01)

A Unified Model for the Degradation Kinetics of Pesticides Applied Continually to SoilsEnglish Full Text

WANG ZONGSHENG, LIU DUOSEN and ZHANG SHUIMING (Institute of Soil Science, Academia Silica, P. O. Box 821, Nanjing 210008 China)

Abstract: This paper deduces a kinetic model for microbial degradation of pesticides in soils:where x is the concentration of pesticide at time t, so the initial concentration of the pesticide, me the initial number of pesticide-degrading microorganisms, M the carrying capacity for the microorganisms, μ the specific growth rate of the microorganisms, and k the rate constant for the pesticide degradation.In periodic applications of pesticides, this model can be used to continuously describe every degradation curve. Whether a lag phase occurs or not, we can obtain the minimum residue of the pesticide （xe）:xe=xdexp（-kMr）/[1-exp（-ker） ]where r is the regular time internals between applications, and xd the dosage of the pesticide.
Keywords：

microorganisms; pesticide degradation; unified model;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S152

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