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Nutrient uptake by weeds as influenced by organic manures, inorganic fertilizers and weed management practices in soybean Merrill



Nutrient uptake by weeds as influenced by organic manures, inorganic fertilizers and weed management practices in soybean Merrill



Acta Agronomica Hungarica 48(2): 141-148



Field experiments were conducted at Tamil Nadu Agricultural University, Coimbatore, during 1994 to 1996 covering two kharif (June-September) and two summer (January-April) seasons to study the combined effect of organic manures and inorganic fertilizer with different weed management practices on weed dry matter production and nutrient uptake by weeds and on the yield of soybean. The results revealed that irrespective of the organic manures applied, the addition of a higher dose of inorganic fertilizers increased the weed dry matter production (DMP) and the nutrient depletion by weeds compared to lower doses of inorganic fertilizers. The combined application of bio-digested slurry at a rate of 5.0 t ha-1 + 20:80:40 kg NPK ha-1 led to the lowest DMP and nutrient depletion by weeds in all the seasons, followed by bio-digested slurry (5.0 t ha-1) + 30:120:40 kg NPK ha-1. At harvest, hand weeding twice decreased the weed DMP and the nutrient depletion by weeds. This was followed by alachlor 1.0 kg ha-1 + hand weeding 40 days after sowing.

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