A kinetic model describing the effect of temperature on the loss rate of pesticides in soil

• Published in: Ecological modelling 1993-11, Vol.70 (1), p.115-125
• Main Authors: Zhang, Shui-Ming, Liu, Duo-Sen, Wang, Zong-Sheng, Ma, Xing-Fa
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Generalities. Disease free stocks; Phytopathology. Animal pests. Plant and forest protection
• ISSN: 0304-3800; 1872-7026
• DOI: 10.1016/0304-3800(93)90075-4

The loss of pesticides in soil consists of biological degradation and nonbiological loss, while the nonbiological loss consists of chemical degradation and physical loss. This paper propounds a kinetic model describing the effect of temperature on pesticidal loss rate: ▪ where x is the concentration of pesticide at time t, k 1 the first-order rate constant at absolute temperature T, k 2 the second-order rate constant at T, c the minimum growth temperature for pesticide-degrading microorganisms, h the maximum growth temperature for the microorganisms, A 1 ∗ and A 2 ∗ the constants relating to the pre-exponential factor of growth process of the microorganisms, E ∗ the activation energy for growth process of the microorganisms, R the gas constant, A 1 and A 2 the constants relating to the pre-exponential factor of nonbiological loss process of the pesticide, and E the activation energy for nonbiological loss process of the pesticide.