Study on the residue of 1-(2-chlorobenzoyl)-3-(4-clflorophenyl)urea in Chinese cabbage and soil in the Southern China and its distribution in laboratorial microcosm

This paper discusses the residue of 1-(2-chlorobenzoyl)-3-(4-chlorophenyl) urea (ccu)in Chinese cabbage and soil in the Southern China．Under single factor controlled condition，the distribution and tramsformation ofCCU in microcosm are described． In field trial oftwo consecutive years，the results show that the haif-life values ofCCU in Chinese cabbage and soil in the Southern China are 3.8-4.1 days and 10.9—11.6 days；respectively．The experimental results in laboratorial microcosm demonstrate the fortnight haft-life of CCU in soil．Vegetables lack of enough ability to absorb CCU from soil and accumulate on roots．Although there are a certain amount residues ofCCU in soil，it is impossible to bring about serious pollution after routine application is carried out．