Bio-efficacy and selectivity of sulfosulfuron and metribuzin before and after irrigation in wheat (Triticum aestivum) under zero-tillage system.
2009
Singh, R.K. | Verma, S.K. | Sharma, Rajvir | Singh, S.B.
A field experiment was conducted during winter (rabi) season of 2003-04 and 2004-05 at agronomy research farm, BHU, Varanasi, to study the bio-efficacy and selectivity of sulfosulfuron and metribuzin befor and after irrigation in wheat (Triticum aestivum L. emend. Fiori and Paol) under zero-tillage system. Eight weed control treatments viz metribuzin 0.21 kg/ha before first irrigation (BFI) metribuzin 0.21 kg/ha after first irrigation (AFI) sulfosulfuron 0.025 kg/ha BFI sulfosulfuron 0.025 kg/ha AFI, isoproturon + 2.4-D 0.75 + 0.5 kg.ha AFI, 1 hand weeding at 30 days after sowing and weedy check were tested in randomized block design with 3 replications. Sulfosulfuron (AFI) significantly reduced weed density, dry weight and NPK depletion by weeds with maximum weed control efficiency (79.4%) and improve the NPK uptake by crop which cause significant impact on crop growth and yield attributes which resulted higher grain yield (3.24 and 3.53 tonnes/ha). Being at par with that of one hand weeding at 30 days after sowing. Isoproturon + 2, 4-D (AFI) significantly reduced density and dry weight of weeds over metribuzin BFi) and sulfosulfuron (BFI) and it was at par with metribuzin (AFI) and 1hand weeding. Among the herbicidal treatments, maximum net returns (Rs 7564 and 9165/ha) and benefit: cost ratio (1.54 and 1.63) was recorded under isoproturon + 2, 4-D (AFI). Hand weeding twice at 30 and 45 ADS recorded significantly higher yield attributes, grain yield, nutrients uotale with maximum weed control efficiency, net returns and benefits: cost ratio over all other weed control treatments.
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