Department of Agronomy, University of Agricultural Sciences, Bangalore - 560 085, India.
Field trials were conducted during summer (dry) and kharif (wet) 1992 at University of Agricultural Sciences, Bangalore to study the crop-weed competition in puddled seeded rice. Seven weed free and seven weed infestation treatments were compared with weed free and unweeded check. Results indicated that grassy weeds dominated over dicots and sedges. Weed free upto 50, 60, 70 and 80 DAS (days after sowing) and weed infestation upto 20, 30, 40 and 50 DAS recorded significantly lower dry weight of weeds and higher yield and yield components. Reduction in grain yield in unweeded check due to weeds competition was 94 and 47% during dry and wet seasons, respectively. Weed free for the first 50 DAS was the critical period for crop-weed competition to obtain higher yield.
