Studies on Crop-Weed Competition for Nutrient and its Effect on Grain Yield of Maize (Var. Ganga-5)

A. V. RAJAN and S. SANKARAN

doi:https://doi.org/10.29321/MAJ.10.A03421

Madras Agricultural Journal

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Studies on Crop-Weed Competition for Nutrient and its Effect on Grain Yield of Maize (Var. Ganga-5)

Author: A. V. RAJAN and S. SANKARAN,

p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 61, Issue: aug-aug,

DOI:https://doi.org/10.29321/MAJ.10.A03421

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Abstract

Field experiment on the competitive effect of weeds for soil nutrients in hybrid maize Var. Ganga-5) indicated that weeds removed about 59 kg N, 10 kg P and 59 kg K per ha at the early stage (30 days) of the crop growth. The weeds removed 7 to 10 times more nut- rients than the crop at this stage. Pre-emergence application of simazine at 1.0 kg a. i/ha effectively checked the nutrient depletion and caused 41, 73 and 35 per cent increase in the NPK uptake of the crop over unweeded control. Simazine-treated crop recorded higher arain yield than the manual weeding treatment,

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