| Abstrakt: |
A field experiment was conducted during kharif 2021 at College of Agriculture, V.C. Farm, Mandya to study the effect of pre-emergence herbicides on growth and yield of direct seeded rice (Oryza sativa L.). The experiment was laid out in RCBD with three replications consisting of nine treatments viz., pretilachlor 30% EC + pyrazosulfuron ethyl 0.75% WG (Pre mix) @ 1500, 2000, 2500 g ha-1, respectively, pyrazosulfuron ethyl 10% WP @ 250 g ha-1, pretilachlor 50% EC @ 1500 ml ha-1, pretilachlor 30% EC + 10% safener @ 1000 ml ha-1, hand weeding (20 & 40 DAS), weed free check and weedy check. The predominant weed flora observed were Echinochloa colona, Cynodon dactylon, Eleusine indica, Dinebra retroflexa, Dactyloctenium aegyptium, Chloris barbata, Physalis minima, Ageratum conyzoides, Portulaca olearacea, Parthenium hysterophorus, Gomphrena decumbens, Cyperus rotundus and Cyperus iria. The results revealed that pre-emergence application of pretilachlor 30% EC + pyrazosulfuron ethyl 0.75% WG pretilachlor 30% EC + pyrazosulfuron ethyl 0.75% WG (Pre mix) @ 2500 g ha-1 at 3 DAS recorded significantly lower total weed count (0.25, 0.72,15.00 and 19.33 No. m-2), weed dry weight (1.22, 3.09, 5.50 and 8.08 g m-2) and weed control efficiency of 84.36, 82.86, 79.00 and 78.82 per cent, respectively at 15, 30, 60 DASP and at harvest. Due to efficient weed control the same treatment recorded high nutrient uptake by the crop (84.42, 43.90 and 63.47 NPK kg ha-1), net monetary returns (Rs.92120 ha-1) and B: C ratio (3.54) and was statistically comparable with weed free check. [ABSTRACT FROM AUTHOR] |
