Author(s): P. THIMME GOWDA, M. GOVINDAPPA *K. N. KALYANA MURTHY, *C. SHANKARAIAH AND A. C. JNANESHA

Abstract: An investigation was undertaken to study the effect of weed control treatments on losses of nutrients caused by weeds in aerobic rice during the kharif season of 2005, in Mandya, Karnataka, India. Treatments consisted of three doses, each of butachlor (0.75, 1.00 and 1.25 kg a.i./ha), pyrazosulfuron ethyl (20, and 30 g a.i./ha) and clomazone + 2,4-DEE (0.75, 1.00 and 1.25 litre/ha), two hand weedings at 20 and 45 DAS, two inter-cultivation at 20 and 45 DAS and weedy control. Data on the effect of weed control treatments on weed growth parameters (weed dry weight and weed population), on nutrient uptake by weeds at harvest (N, P and K), on yield (number of effective tillers per hill, grain yield and straw yield) and on nutrient uptake of aerobic rice at harvest (N, P and K), are tabulated.

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