Effect of dual cropping of green manure crops and weed management practices on the yield attributes, yield and nutrient uptakeof semi-dry rice

摘要

A field experiment was conducted during rabi 2004-05 (first crop) and 2005-06 (second crop) to study the effect of dual cropping of green manure crops and weed management practices on the yield attributes, yield and nutrient uptake of semi-dry rice. The experiment was laid out in split plot design with three replications. The main plot treatments consisted of in situ dual cropping of two green manure crops (daincha and cowpea) with rice and two methods of green manure incorporation (manual incorporation and chemical decomposition). Three weed control treatments viz., pendimethalin - hand weeding, hand weeding twice and unweeded control formed the sub plot treatments. The results revealed that the dual cropping of cowpea and incorporated manually at30 days after sowing (DAS) and pre-emergence application of pendimethalin at 1.25 kg/ha followed by one hand weeding at 45 DAS recorded the higher yield attributes, yield, net returns and benefit : cost ratio of semi-dry rice cultivation.