Influence of weed and nitrogen management on weed growth, nutrient uptake and yield of wheat (Triticum aestivum)

Prasad, K.; Singh, R.S.

Indian Journal of Agricultural Sciences 65(2): 117-122


ISSN/ISBN: 0019-5022
Accession: 002873278

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An experiment was conducted during the winter season of 1991-92 and 1992-93 at Ranchi, on weed management in wheat (Triticum aestivum) cv. Sonalika under different nitrogen (N) levels. An increase in N level increased the weed density, its dry matter accumulation and NPK depletion. Post-emergence application of isoproturon at 0.75 kg/ha + 2,4-D Na salt at 0.75 kg/ha gave better control of weeds than their separate application at 1.0 kg/ha each in both seasons. The resulting weed control was comparable with that of weeding by dutch hoe (at 15, 30 and 45 days after sowing) in minimizing weed density, dry weight and nutrient depletion by weeds, as well as in improving the nutrient uptake and grain yield of wheat. Wheat grain yields at 80 and 120 kg N/ha (2826 and 2904 kg/ha) were not significantly different. Interaction effects of N levels and weed control methods indicated that a sustainable wheat yield (3625 kg/ha) could be obtained at 80 kg N/ha with post-emergence application of isoproturon at 0.75 kg/ha + 2,4-D Na salt at 0.75 kg/ha.