Rajkumara, S. and Palled, Y.B. and Hebsur, N.S. and et al, .
(2010)
Nitrogen uptake and economics of rainfed drill sown onion (Allium cepa L.) + chilli (Capsicum annuum L.) + cotton (Gossypium herbaceum L.) intercropping system under different weed free periods.
Karnataka Journal of Agricultural Sciences, 23 (4).
pp. 590-594.
Abstract
A field experiment was conducted at Water Management Research Centre, Belvatagi for 2 years (2005-06 and 2006-07) to find out the weed free requirement of onion + chilli + cotton intercropping under rainfed Vertisols. The experiment was conducted in completely randomized block design with three replications. The treatments include weed free period upto 20 days after sowing (DAS), weed free upto 40 DAS, weed free upto 60 DAS, weed free upto 80 DAS, weed free upto 100 DAS, weed free upto 120 DAS, weed free between 20- 120 DAS, weed free between 40 – 120 DAS, weedy check and weed free check for the entire period of onion + chilli + cotton. Significantly lower and zero nitrogen uptake was observed by weeds in weed free check treatment followed by weed free upto 120 DAS. Weedy check throughout the crop period accumulated dry weed biomass of 8704 kg/ha which resulted in uptake of 141.52 kg/ha of nitrogen. Weed free upto first 120 DAS allowed onion, chilli and cotton for maximum nitrogen uptake (124.5 kg/ha) after weed free check (145.9 kg/ha). Significantly higher gross returns (Rs.1,13,200/ha) and net returns (Rs. 91,020/ha) was obtained in weed free check followed by weed free period upto 120 DAS. BC ratio obtained in weed free check (5.11) and weed free period upto 120 DAS (4.60) were on par
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