Effect of weed management on growth, yield and nutrient uptake of greengram

A field experiment was conducted during Kharif of 2013 at Agriculture Research Station, SK Rajasthan Agricultural University, Bikaner, Rajasthan, India with combination of 16 weed control treatments in three replications. Weed free check (two hand weeding at 20 and 40 DAS) was found most effective to control weeds in greengram and recorded lowest weed density, weed dry matter and weed index and highest weed control efficiency. It was also recorded significantly highest growth and yield attributes in greengram over all the other treatments, viz. plant height, dry weight of nodules, dry matter accumulation, number of pods/plant, seeds/pod and seed yield/ha. The maximum net return of 50,102/ha and B: C ratio (3.05) was recorded under weed free treatment. Among the different herbicides, preemergence application of pendimethalin 0.75 kg/ha + post-emergence application of imazethapyr 40 g/ha at 30 DAS recorded significantly higher net returns of 48,108/ha and B:C ratio (2.98).