Author(s):

Pramendra Singh Parmar, AK Vishwakarma, KC Sharma and Mansingh Baghel

Abstract: The experiment was laid out tostudy on ‘Effect of Different Herbicides on Weed intensity and dry weight under rain-fed Condition of Central India in Soybean [Glycine max (L.) Merrill]’.The experiment was laid out in “randomized block design” with nine treatments, and replicated thrice. The major weeds viz; Echinochloacolonumand Commelinabenghalensis among the monocots and Digeraarvensis, Phyllanthusniruri, Trianthemamonogyna,Corchorusolitorious, andLeucasasperaamong dicots were present whereas Cyperusrotunduswas only sedge present in the experimental area. The relative density of dicots was 65.17% at harvest while monocots were to the extent of 34.82% of total weed population. All the herbicidal treatments and hand weeding reduced the weed intensity as compared to weedy check. Hand weeding twice was most effective and recorded minimum weed intensity among all the treatments. The result indicated that pendimathalin and imazethapyr + imazamox (Odyssey) was effectively reduced the population of both grassy and broad leaved weeds and was found effective as quizalofop-ethyl fbchlorimuron ethyl and all these herbicidal treatments were not significantly differing with hand weeding twice which registered the lowest intensity of grassy and dicot weeds among all the treatments, whereas weedy check recorded significantly the highest intensity of weeds. The weed control efficiency (WCE) among herbicides and its combination varied from 27.51- 82.40%. The highest weed control efficiency was recorded under hand weeding twice at 20 and 40 DAS (96.27%) followed by post emergence application of imazethapyr + imazamox (82.40%).Seed yield and Stover yield was significantly higher under two hand weeding at 20 & 40 DAS recorded the higher seed yield (922.22 kg ha^-1) followed by imazethapyr + imazamox @ 70 g a.i. ha^-1 (797.22 kg ha^-1). Stover yield under all the herbicidal treatments (except glyphosate) and hand weeding twice at 20 and 40 DAS (1152.78 kg ha^-1) was significantly higher than weedy check (805.56 kg ha^-1). Similarly, harvest index increased significantly under all the herbicides varied from 39.95 – 42.73% than weedy check. The weed index was maximum under glyphosate (35.63%) followed by quizalofop-ethyl (29.57%), alachlor (27.39%) and pendimathalin (25.17%) among the herbicidal treatments, whereas the highest yield losses were recorded under weedy check (52.25%).

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