Efficacy of different herbicides on the yield and yield components of maize
2003
Khan, M.A. | Marwat, K.B. | Khan, N. | Khan, I.A. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Weed Science)
The research work was conducted to investigate the effectiveness of various weed control measures in maize hybrid P-3203. The treatments were pre- emergence application of dual gold (S-metolachlor) at 1.92, primextra (atrazine + metolachlor) at 2.25, treflan (trifluralin) at 1.5, stomp (pendimethalin) at 0.75 and Jinong (atrazine) at 0.90 kg a.i. ha-1 and post- emergence application of 2,4- D at 0.80 and banvel (dicamba) at 0.84 kg a.i. ha-1. The treatments increased plant height (cm), cob length (cm), biological yield (t ha-1), leaf area (cm2), number of leaves plant-1, number of kernels cob-1, 500 kernel weight (g) and grain yield (t ha-1) significantly (P less than or equal to 0.05), while broadleaf weeds, number of cobs plant-1 and harvest index were not significantly affected by different treatments. For controlling weeds, dual gold suppressed 88, primextra 82, stomp 45, treflan 48, Jinong 38, 2,4-D 23 and banvel 5% as compared to 248.7 number of weeds m-2 in weedy check. The dominant weed species found were Leptochloa sp., Echinochloa crus-galli, Cyprus sp. and Digitaria sanguinalis. Hand weeded and dual gold treated plots produced significantly taller plants, more kernels per cob (548.7 and 544.7) and the highest 500 kernel weight (121.33 and 119 g), respectively. Hand weeded, dual gold and primextra treated plots increased grain yield by 22.7, 21 and 15.3%. Application of dual gold proved to be the best and most economical weed control, giving maximum returns of Rs. 42030 ha-1. Primextra emerged as the next best alternative for weed management in maize.
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