IMPROVE SOIL HEALTH AND ENVIRONMENT: EFFECT ON HERBICIDES ON SOIL MICROBIAL POPULATION IN KHARIF GROUNDNUT AND RESIDUAL EFFECT ON SUCCEEDING CROPSSatyakumari Sharma, B.K. Sagarka, R. Sharma and M. Meena
An experiment was conducted in randomized block design with twelve treatments replicated thrice during the kharif seasons of 2012-13 and 2013-14 on medium clayey soil at Junagadh Agricultural University, Junagadh to study the effect of herbicides on soil microbial population and residual effect on succeeding crops. Results revealed that significantly higher soil bacterial and fungal colony at 1, 21, 45 Days after application and after harvest of groundnut were recorded with weed free, closely followed by HW & IC at 20 & 40 DAS and unweeded control at 1DAA, and with application of pendimethalin 30% EC @ 0.900 kg ha-1 as PE + HW & IC at 40 DAS and propaquizafop @ 90 g ha-1 as POE at 20 DAS + HW & IC at 40 DAS at 21, 45 DAA and at harvest. This treatment has somewhat temporary adverse effect on soil bacterial and fungal population and maintained soil nutrient status in soil after harvest of crop, but no any residual effect on germination, plant height and dry matter of succeeding winter crops viz., wheat, gram, mustard and maize.
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