Performance of Different Herbicides in·transplanted Basmati Rice ( Oryza Sativa L.) Under Different Conditions

Abstract

A field experiment was conducted in rice during kharifseason 2011-12 on sandy loam soil at Crop Research Centre, Chirauri of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U.P.).The experiment was conducted in R.B.D with three replications comprising ten treatments of weed management (weedy in puddled condition, weed free in puddled condition, Pretilachlor @ 750 g a.i. /ha in puddled condition, Oxyfluorfen @ 200 g a.i./ha in puddled condition, Pyrazosulfuron@ 20 g a.i./ha in puddled condition, weedy in unpuddled condition, weed free in unpuddled condition, Pretilachlor @ 750 g a.i. /ha in unpuddled condition, Oxyfluorfen @ 200 g a.i./ha in unpuddled condition and Pyrazosulfuron@ 20 g a.i./ha in unpuddled condition. The results indicated that chemical methods of weed control significantly reduced the weed population and dry weight effectively over weedy check. The tallest plants, higher number of tillers m-2 highest dry matter accumulation, weed control efficiency nutrient uptake and grain yield (48.57 & 42.76 q/ha) were recorded with the application of Pretilachlor @ 750 g a.i./ha, which established its superiority over rest of the herbicides in puddled and unpuddled conditions. Similarly, application of Pretilachlor @ 750 g a.i./ha resulted into higher gross return, net return and 8: C ratio. The total nitrogen, phosphorous and potassium uptake by rice crop was also highest under this treatment as II 0.42 & 94.82, 30.05 & 26.97 and 124.56 & I 17.23 kg/ha respectively in puddled and unpuddled conditions. With the application of pretilachlor@ 750 g a.i.n1a the per cent increase in grains and straw yield was 46.1 & 39 and 40.15 & 47.78 as compared to weedy check in both conditions.