Field experiments on the competitive effect of weeds for soil nutrients in hybrid maize (Ganga 5) indicated that weeds removed about 85 kg N, 8 kg P 205 and 47 kg Kg 0/ha at the early stage (30 days) of the crop growth. The weeds removed seven times more nutrients than the crop at this stage. Pre- emergence application of Simazine at 1.00 kg a. i./ha plus one hand weeding as well as hand weeding twice effectively checked the nutrient depletion by weeds and increased the NPK uptake of the crop. The grain yield in these two treatments was higher when compared to the rest of the weed control treatments which included 2, 4-D alone and in combination with manual weeding due to increased uptake of nutrients by crop and minimum removal of nutrient by weeds.
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