Herbicides evaluation for control of weed flora in wheat (Triticum aestivum L.)
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Date
2013-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Field experiment was conducted during Rabi season of 2012-13 at Norman. E. Borlaug Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar to evaluate the Herbicides to control weeds in wheat (Triticum aestivum L.). Fourteen treatments i.e. metribuzin 210 g a.i./ha, clodinafop 60 g a.i./ha, pinoxaden 40 g a.i./ha, sulfosulfuron 25 g a.i./ha, clodinafop+metribuzin 60+210 g a.i./ha, pinoxaden+metribuzin 40+210 g a.i./ha, sulfosulfuron+metribuzin 25+210 g a.i./ha, fenoxaprop+metribuzin 120+210 g a.i./ha, sulfosulfuron+metsulfuron 32 g a.i./ha, mesosulfuron+iodosulfuron 14.4 g a.i./ha, clodinafop+metsulfuron 60+4 g a.i./ha and Isoproturon+2,4-D 1000+500 g a.i./ha were applied 35 days after sowing of the wheat crop. Weedy check and weed free were also included. All the treatments were replicated three times. Experiment was conducted in randomized block design. The soil of experimental field was silty loam with pH 7.4, available nitrogen 227 kg/ha, available phosphorus 45 kg/ha and available potassium 140 kg/ha. Phalaris minor among grasses, Chenopodium album, Polygonum plebejum and Medicago denticulata among non-grasses were the major and dominant weeds in experimental area. Some more weeds i.e. Avena fatua, Cynodon dactylon (grasses), Melilotus indica, Coronopus didymus, Anagalis arvensis, Rumex acetocella, Vicia sativa, Fumaria parviflora (non-grasses), and Cyperus rotundus (sedge) were recorded as minor weeds. These weeds were less in number and erratic. Among all the herbicides (alone or in combination) pinoxaden 40 g a.i./ha, controlled Phalaris minor and other non-grasses effectively followed by sulfosulfuron 25 g a.i./ha. Among various combinations i.e. clodinafop+metsulfuron 60+4 g a.i./ha and sulfosulfuron+metsulfuron 32 g a.i./ha were controlled total weeds effectively. Highest grain yield (46.4 q/ha) was obtained from weed-free plots followed by pinoxaden 40 g a.i./ha (45 q/ha). Yield contributing characters viz. number of spikes/m2, number of grains/spike, 1000-grain weight(g), number of fertile spikelets/m2 were also recorded highest in weed-free plot and pinoxaden 40 g a.i./ha. The uncontrolled weeds reduce grain yield of wheat by (49.7 q/ha) in untreated plots. Net return and B:C ratio, Rs. 48159 and 2.2 in pinoxaden 40 g a.i./ha, Rs. 46829 and 2.1 in clodinafop+metsulfuron 60+4 g a.i./ha respectively.
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