Vol. 4 No. 2
Effect of anilofos and pendimethalin herbicides on N2-fixing and phosphate solubilizing microorganisms in relation to availability of nitrogen and phosphorus in a Typic Haplustept soil.
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 pre-emergence herbicides, viz. anilofos and pendimethalin either alone or in a combination, at their recommended field application rates (400 g and 1.0 kg a.i./ha., respectively) on the growth and activities of aerobic non-symbiotic N2-fixing bacteria and phosphate solubilizing microorganisms as well as their role in the transformations and availability of nitrogen and phosphorus in Typic Haplustept in West Bengal. Application of the herbicides, in general, stimulated the growth and activities of aerobic non-symbiotic N2-fixing bacteria and phosphate solubilizing microorganisms resulting in an increased availability of nitrogen and phosphorus in soil. Anilofos highly augmented the proliferation and activities of aerobic non-symbiotic N2-fixing bacteria and accumulated highest amount of available nitrogen and phosphorus in soil. The combined application of herbicides highly stimulated the growth and activities of phosphate solubilizing microorganisms in soil.
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