Effect of Chemical Weed Management on Growth and Yield in Puddled and Unpuddled Transplanted Rice (Oriza sativa L.)

Abstract

A field experiment was conducted at KrishiVigyan Kendra, Aurangabad and in farmers’ field during rainy seasons of 2014  to evaluate Effect of chemical weed management on growth and yield in puddled and unpuddled transplanted rice (Oriza sativa L.) .Experiment was laid out in a split-plot design with 2 methods of establishment i.e. puddled transplanted rice (PTR) and unpuddle transplanted rice (UTPR), and four methods of weed control viz. W₁: Azimsulfuron 12.5g a.i./ha+ byspyribac-sodium@15g a.i./ha POE, W₂: Azimsulfuron 20g a.i./ha+ byspyribac-sodium@25g a.i./ha POE, W₃: Byspyribac-sodium@25g a.i./ha + pyrazosulfuron 20g a.i./ha POE ,W4: Pretilachlor 500g a. i./ha PRE + 1 HW 45 DAT (Farmers’Practice) in a total of ten replications including five at KVK, Aurangabad and five farmers’ field during the years. Unpuddled transplanting planting method produced significantly higher grain yield (4509kg/ha) over puddled transplanting method. Higher net return and B-C ratio were recorded with unpuddled transplanting method (Rs. 20873/ha, 1.58) over puddled transplanting. Application of azimsulfuron 20g ai/ha + bispyribac-sodium@ 25 g ai/ha as POE being at par with bispyribac-sodium 25g a.i./ha.+ pyrazosulfuron 20g a.i./ha,  were superior to azimsulfuron 12.5g ai/ha + bispyribac-sodium@ 15 g ai/ha as POE  and pretilachlor 500g a.i./ha PRE + one hand weeding at 45 DAT treatments and it resulted into higher grain yield (4728 kg/ha). Net return and B-C ratio were higher in plots treated with azimsulfuron 20g ai/ha + bispyribac-sodium @ 25 g ai/ha as POE (Rs.21643/ha and 1.61), which being at par with bispyribac-sodium 25g a.i./ha.+ pyrazosulfuron 20g a.i./ha, was superior to azimsulfuron 12.5g ai/ha + bispyribac-sodium@ 15 g ai/ha as POE, and  pretilachlor 500g a.i./ha PRE + one hand weeding at 45 DAT

Key words: Crop establishment, Unpuddled, Rainfed, Drought tolerant rice varieties, Economics