Browsing by Author "THAKUR, ARVIND SINGH"
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ThesisItem Open Access STANDARDIZATION OF DOSES OF NEW HERBICIDES TO MANAGE WEEDS IN SOYBEAN (Glycine max L.)(CSK Himachal Pradesh Krishi Vishavavidyalaya, Palampur, 2007) THAKUR, ARVIND SINGH; Kumar, SureshThe field experiment entitled, “Standardization of doses of new herbicides to manage weeds in soybean (Glycine max L.)” was conducted at the experimental farm of the Department of Agronomy, Himachal Pradesh Krishi Vishvavidyalaya Palampur during kharif season of 2005. In order to meet out the objectives, 15 treatments were tested in Randomized Block Design (RBD) with three replications. The treatments consisted of pre-emergence application of acetachlor and trifluralin each at 1.0, 1.25 and 1.5 kg ha-1, post-emergence application of haloxyfop methyl 0.075, 0.100 and 0.125 kg ha-1, quizalofop methyl 0.0375, 0.050 and 0.0625 kg ha-1, pre-emergence application of alachlor 1.5 kg ha-1, hand weeding twice (30 and 60 days after sowing) and unweeded check. The soil of the experimental site was acidic in reaction (pH-5.6), silty clay loam in texture, and medium in available nitrogen (284.8), phosphorus (14.6) and potassium (268). Among post-emergence herbicides haloxyfop methyl 0.100 kg ha-1 resulted in highest weed control efficiency which was 72.0 per cent at harvest stage. Whereas, preemergence application of herbicides, acetachlor 1.5 kg ha-1 recorded highest weed control efficiency of 72.3 per cent at harvest. Among different doses of herbicides acetachlor 1.5 kg ha-1 (pre), haloxyfop methyl 0.100 kg ha-1 (post) and quizalofop ethyl 0.0625 kg ha-1 (post) were more effective to control weeds. Haloxyfop methyl 0.100 kg ha-1 and quizalofop ethyl 0.0625 kg ha-1 were most effective to control grassy weeds and only acetachlor control grassy as well as broad leaves weeds. Haloxyfop methyl (post) 0.100 kg and 0.125 kg ha-1, quizalofop ethyl (post) 0.0625 kg, acetachlor (pre) 1.5 kg ha-1 and trifluralin (pre) 1.5 kg ha-1 resulted in significantly higher plant dry weight, higher number of branches per plant, pods per plant, seeds per pod, 1000 seed weight and seed yield of soybean. Haloxyfop methyl 0.100 kg ha- 1 (post) resulted in higher gross returns (Rs 40,300), net returns (Rs, 27,614) and net returns per rupee invested (Rs. 2.17).