Efficacy of planting technique, cultivar and weed control selectivity on wheat yield and associated weeds in Indo-Gangetic Plains.

摘要

Sustaining and improving the productivity of wheat in Indo-Gangetic Plains of India would require research focused to evolve new and innovative production technologies. A study was conducted during winter seasons of 2008-09 and 2009-10 to evaluate the effects of three planting techniques (furrow irrigated raised bed system-FIRBS, conventional tillage-CT and zero till-ZT), wheat cultivars (WH 711, WH 1022 and PBW 343), weed control treatments (some weed control treatments (clodinafop fb metsulfuron @ 60 & 4 g/ha, weedy and weed free)) and their interaction on the productivity of wheat and associated weeds. The weed population and dry weight were significantly lower when the crop was planted on FIRBS as compared to ZT and CT. Weed infestation was lower in cultivar PBW 343 than cultivars WH 711 and WH 1022. Application of clodinafop fb metsulfuron @ 60 & 4 g/ha effectively controlled the weed flora over weedy check and was comparable with weed free treatment. The crop planted on FIRBS produced 0.4 and 3.4% higher grain yield than ZT and CT, respectively. Cultivar PBW 343 produced higher grain yield than cultivars WH 711 and WH 1022. No significant differences were found in grain yield obtained with the application of clodinafop fb metsulfuron and weed free treatments. However, both weed control treatments resulted in significant yield gains over weedy check. The interaction between planting techniques x weeding methods and planting techniques x cultivars was significant. The results revealed that application of clodinafop fb metsulfuron in wheat planted on FIRBS provided effective control of weeds comparable to weed free crop planted either on FIRBS or ZT and CT. Cultivar PBW 343 produced highest grain yield under FIRBS and CT, whereas cultivar WH 711 performed better under ZT.