Author(s): S. NONGTHOMBAM, H. NAYEK AND A. C. DAS

Abstract: An experiment was conducted under laboratory condition to investigate the effect of two systemic herbicides, viz. anilofos (S-[N-(4- chlorophenyl)-N-isopropylcarbamyl]-O,O-dimethyl phosphorodithioate) and pendimethalin (N-(1- ethylpropyl) -2, 6-dinitro-3,4- dimethyl aniline), either alone or in combinations, at their recommended field rates (400 g and 1.0 kg a.i./ha, respectively on the mineralization of carbon and nitrogen, and changes in total phosphorus content in a Haplustept soil of West Bengal. Application of herbicides in general, stimulated the mineralization of carbon and nitrogen in soil. Single application of anilofos and pendimethalin augmented retention of organic carbon and availability of exchangeable NH4 + in soil. Application of herbicides either singly or in combinations retained 9% higher total nitrogen as compared to untreated control soil. Anilofos increased the availability of NO3 --N to the highest extent (36.3%). Incorporation of pendimethalin increased 20.7% exchangeable NH4 + in soil. The retention of total phosphorus was significantly increased (14.3%) due to the pendimethalin and its combination with anilofos.

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