INFLUENCE OF PHOSPHAMIDON ON MICROBIAL BIOMASS CARBON, FDA AND SOIL RESPIRATION IN BLACK SOIL (ENTIC CHROMUSTERTS)
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 39
Abstract
Phosphamidon [2-chloro-2-diethylcarbamoyl-1-methylvinyldimethyl phosphate], is a broad spectrum, non-cumulative systemic organophosphorus pesticide widely used in agriculture. The potential harmful effect on soil microbial biomass and its activity was accessed in the vertisol soil under controlled laboratory conditions. We examined the effect of recommended (RD) and double the recommended doses (2RD) of phosphamidon on soil respiration, microbial biomass carbon (MBC) and fluorescein diacetate (FDA) hydrolyzing activity. The incubation study was carried out at 60 % of maximum water holding capacity of the soil sample at 28±2 °C for a period of 42 days. Our results indicated that MBC in soil increase significantly with time up to 14 days for all the treatment doses indicating adoption of microbes to use the pesticides as carbon or energy source. Thereafter, the value decline and reach the lowest 37% of the control on 42 days. There was no significant change in FDA and soil respiration, which increase with the period of incubation, but the value of pesticide treated where less compared to that of control. Our results provide the first evidence that Phosphamidon differentially affected the soil microbial community through inhibiting fungal and bacterial populations.
Authors and Affiliations
NISHA SAHU
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