BIOEFFICACY OF NEW POST EMERGENCE HERBICIDE MIXTURE BAS 835 UBH IN SOYBEAN [GLYCINE MAX (L.) MERRILL]
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Date
2017
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Indira Gandhi Krishi Vishwavidhyalaya, Raipur
Abstract
The present investigation entitled “Bioefficacy of new post emergence herbicide mixture BAS 835 UBH in soybean [Glycine max (L.) Merrill]” was carried out during kharif season of 2016 at Instructional cum Research Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, with the objective to find out suitable weed management practices for growing soybean under the agro-climatic condition of Chhattisgarh plain. The soil of experimental field was clayey in texture, low in nitrogen, medium in phosphorus and high in potassium contents with neutral pH. The experiment was laid in randomized block design having the combination of nine different herbicide treatments replicated thrice. The soybean variety ‘JS 97-52’ was grown as test crop.
The results of the experiment indicated that the growth characters like plant height, number of branches, number and dry weight of nodules, leaf area index, dry matter accumulation, number of pods plant-1, number of seeds pod-1, seed yield (22.89 q ha-1) and stover yield were increased with hand weeding twice at 20 and 40 DAS and comparable with herbicide application of imazethapyr @ 100 g a.i. ha-1(22.22 q ha-1) and imazamox @ 42 g a.i. ha-1 (21.39 q ha-1). The herbicide mixture treatments BAS 835UBH (imazethapyr 23 g l-1 + imazamox 23 g l-1 + bentazone 460 g l-1) @ 800 g a.i. ha-1 was found superior to rest of the mixture treatment. In the experiment field, the major weeds were Echinochloa colonum, Cynodon dactylon, Alternanthera sessilis, Euphorbia geniculata, Phyllanthus niruri, Digitaria sanguinalis, Cyperus rotundus, Commelina benghalensis and some other weeds were dominat and observed the crop growth period. As regard to weed management practices, lowest density and dry matter of weeds and higher weed control efficiency were recorded under hand weeding twice closely followed by imazethapyr @ 100 g a.i. ha-1, imazamox @ 42 g a.i. ha-1 and herbicide mixture applied treatment, BAS 835UBH (imazethapyr 23 g l-1 + imazamox 23 g l-1+ bentazone 460 g l-1) @ 800 g a.i. ha-1. The minimum weed growth rate was recorded under hand weeding twice, which was followed by imazethapyr @ 100 g a.i. ha-1, imazamox @ 42 g a.i. ha-1.
Net returns (Rs 45,741 ha-1) and B:C ratio (2.01) were maximum under imazethapyr @ 100 g a.i. ha-1, followed by imazamox @ 42 g a.i. ha-1, and hand weeding twice at 20 and 40 DAS. The herbicide mixture applied treatment, BAS 835UBH (imazethapyr 23 g l-1 + imazamox 23 g l-1 + bentazone 460 g l-1) @ 800 g a.i. ha-1, generated highest net returns and B:C ratio among the herbicide mixture treatments. The lowest net returns and B:C ratio was observed under untreated check.
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