Persistence of myclobutanil and its impact on soil microbial biomass C and dehydrogenase enzyme activity in tea orchard soils

Abstract

Persistence of the fungicide myclobutanil in three tea orchard soils with differentcultivating ages, neighboring wasteland and forest soils, and its influence on microbialactivities in 2- and 50-year-oldtea orchard soils at three rates were studied in thelaboratory. Dissipation data fitted well to first-order kinetic equation, except forsterilized treatments, in which neglected dissipation of myclobutanil was observed. At25oC, the dissipation half-lives (DT50) at level of 1mg kg-1 were in the range of 15.07-69.32 days under non-flooded condition, significantly lower than flooded condition (p