Efficacy of ammonium salt of Glyphosate 71% SG on weed management in cotton and its influence on soil micro-flora.

A field trail was conducted during the pre-kharif season of 2011 and 2012 Bidhan Chandra Krishi Viswavidyalaya, West Bengal to evaluate the weed management practices through ammonium salt of Glyphosate 71% SG and its influence on soil micro-flora in -1 cotton. The application of Glyphosate 71% SG on inter row in cotton @ 3.5 l ha recorded better weed control efficiency in comparison to its lower dose though the result showed at par results with hand weeding (at earlier stages), applications of -1 -1 Glyphosate 41% SL @ 3 l ha and Paraquat dichloride 24%SL @ 2.5 l ha increased the yield of cotton under irrigated condition. Initially after application herbicides with different doses reduced the microflora population significantly but after the degradation it increased microflora (bacteria, actinomycetes and fungi) population considerably. Key word: Cotton, microflora, weed control efficiency, weed density, yield 711 202