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Response of soil microflora in herbicide residue of winter irrigated cotton.

机译:冬季灌溉棉花除草剂残留物中土壤微生物区系的响应

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摘要

Field experiments were conducted during winter seasons of 2008-09 and 2009-10 at Eastern Block Farm, Tamil Nadu Agricultural University, Coimbatore to study the efficiency of new formulation pre-emergence herbicide pendimethalin 38.7% on growth and development of cotton to ensure the better weed management in a cost effective manner. Pendimethalin 38.7% was tried in four different doses viz., 1.5, 2.0, 2.5 and 4.0 kg/ha and it was compared with pendimethalin 30% @ 1.0 kg/ha, early post-emergence herbicide trifloxysulfuron, power weeders and hand weeding. The experimental results revealed that the herbicides exerted a significant detrimental effect on soil bacteria, fungi and actinomycetes. The counts of bacteria, fungus and actinomycetes recorded at 3 DAHS revealed that soil microbes were more sensitive to pendimethalin (38.7%) 1.5, 2.0, 2.5 and 4.0 kg/ha and pendimethalin (30%) 1.0 kg/ha as evident from significant reduction in their population on 15 and 30 DAHS, eventually microbial density started to recover slowly.
机译:在Coimbatore的Tamil Nadu农业大学的Eastern Block Farm的2008-09和2009-10冬季进行了田间试验,研究了新配方出苗前除草剂戊二甲戊灵对棉花生长发育的效率为38.7%,以确保更好的棉花生长。以经济有效的方式进行杂草管理。尝试了4.5%,1.5、2.0、2.5和4.0 kg / ha的二甲戊乐灵38.7%,并将其与30%@ 1.0 kg / ha的二甲戊乐灵,出苗后早期除草剂三氟草磺隆,强力除草剂和手除草剂进行了比较。实验结果表明,除草剂对土壤细菌,真菌和放线菌有明显的损害作用。 3 DAHS记录的细菌,真菌和放线菌计数表明,土壤微生物对二甲戊乐灵(38.7%)1.5、2.0、2.5和4.0 kg / ha和二甲戊灵(30%)1.0 kg / ha更为敏感,这从明显减少可明显看出在15和30 DAHS的人口中,最终微生物密度开始缓慢恢复。

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