Effect of weed management and sulphur levels on weed density, nutrient depletion and productivity of cluster bean [Cyamopsis tetragonoloba (L.) Taub]
2022
Yadav, R.K. | Mundra, S.L. | Samota, Santosh Devi | Yadav, S.L.
An experiment was conducted during kharif seasons of 2013 and 2014 at Instructional Farm of Rajasthan college of Agriculture, Udaipur (Rajasthan) to evaluate the effect of weed management and sulphur nutrition on weed density, their biomass, nutrient uptake by weeds and productivity of cluster bean [Cyamopsis tetragonoloba (L.) Taub]. Manual weeding twice at 20 and 40 days after sowing recorded minimum weed count and weed dry matter at 25 DAS. The minimum weed dry matter of narrow-leaved (129 kg ha-1) and broad-leaved (106 kg ha-1) was recorded under two hand weeding treatment which was closely followed by sequential application of pre-emergence application of pendimethalin 0.75 kg ha-1 followed by post emergence application of imazethapyr 0.075 kg ha-1. Weed control efficiency (WCE) was found highest in treatment in hand weeding twice treatment (89.54%) followed by PE application of pendimethalin 0.75 kg ha-1 followed by post emergence application of imazethapyr 0.075 kg ha-1 (94.18%). Minimum depletion of N by narrow (2.22 kg ha-1) and broad-leaved weeds (2.24 kg ha-1) was recorded under two hand weeding. Amongst herbicides pendimethalin fb imazethapyr was significantly superior over rest of the herbicidal treatments. The highest seed (1218 kg ha-1), haulm (2440 kg ha-1) and biological yield (3657 kg ha-1) was in hand weeded twice treatment. The extent of enhancement protein yield due to two hand weeding, pendimethalin fb imazethapyr, pendimethalin fb quizalofop-ethyl, imazethapyr and pendimethalin was 202.25, 195.80, 160.62, 108.46, and 99.21 kg ha-1, respectively compared to weedy check (101.12 kg ha-1).
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