Study on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]

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dc.contributor.advisorMeena, D. S.
dc.contributor.authorMEENA, BHARAT LAL
dc.date.accessioned2021-12-08T06:39:23Z
dc.date.available2021-12-08T06:39:23Z
dc.date.issued2020-12-08
dc.descriptionStudy on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]en_US
dc.description.abstractA field experiment entitled “Study on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]” was conducted during kharif 2019 at Agricultural Research Station, Ummedganj, Kota. The experiment comprised eight treatments viz., pendimethalin 30% EC @ 1.0 kg a.i.ha-1 as pre emergence, pendimethalin 30% EC + imazethapyr 2% SL (premix) @ 960 g a.i.ha-1as pre emergence, sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i.ha-1 at 20 DAS, quizalofop ethyl 5% EC @ 50 g a.i.ha-1 at 20 DAS, imazethapyr 10% SL @ 100 g a.i.ha-1 at 20 DAS, imazethapyr 3.75% + propaquizafop 2.5% ME (premix) @ 50 + 75 g a.i. ha-1 at 20 DAS, two hand weeding at 20 & 40 DAS and weedy check was laid out in randomized block design with three replications. The results showed that experimental field was infested with grassy weeds (48.60%), broad leaved weeds (39.49%) and sedges (11.91%). All the weed management practices reduced weed density, weed dry matter and nutrient depletion by weeds at all the stages. Two hand weeding at 20 and 40 DAS brought about the maximum reduction in weed density and weed dry matter production at 30 and 60 DAS and at harvest and resulted in the lowest depletion of nutrients (N, P, K) at harvest. The highest weed control efficiency of 77.79 per cent at 60 DAS was also obtained with two hand weeding, followed by application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i. ha-1 at 20 DAS with 66.67 per cent.The maximum values of growth parameters and yield attributes were obtained with two hand weeding, which were significantly superior over rest of the herbicides and weedy check except sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i. ha-1 at 20 DAS with respect to some characters. Among the herbicidal treatments, application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i.ha-1 at 20 DAS recorded maximum crop dry matter accumulation row length metre-1, plant height, pods plant-1 and seed yield plant-1, which were significantly higher over weedy check. All the weed management practices significantly enhanced seed and straw yields and quality (oil yield and protein yield) and nutrient uptake by soybean over weedy check. Two hand weeding at 20 and 40 DAS was registered highest soybean seed yield (1800 kg ha-1), straw yield (2592 kg ha-1), oil yield (366 kg ha-1) and protein yield (739 kg ha-1) followed by application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i.ha-1 at 20 DAS (1550, 2233, 314 and 630 kg ha-1, respectively), which were significantly superior over weedy check. Maximum uptake of nutrients N (174.4 kg ha-1), P (8.8 kg ha-1) and K (78.9 kg ha-1) by crop were recorded under two hand weeding followed by application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i.ha-1 at 20 DAS (149.2, 7.5 and 67.7 kg ha-1, respectively) as compared to rest of the treatments. All the weed control treatments significantly reduced nutrient depletion (N, P & K) by weeds over weedy check. Maximum depletion of nutrients N (50.2 kg ha-1), P (3.58 kg ha-1) and K (41.4 kg ha-1) by weeds were recorded under weedy check followed by application of pendimethalin 30% EC @ 1.0 kg a.i. ha-1 as pre emergence (28.1, 1.98 and 23.0 kg ha-1, respectively) as compared to rest of the treatments, whereas minimum depletion was recorded under two hand weeding at 20 and 40 DAS. Among all weed control treatments, maximum net return (₹ 39571 ha-1) was recorded under two hand weeding at 20 and 40 DAS followed by application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i. ha-1 at 20 DAS (₹ 38204 ha-1). Whereas, highest B: C ratio was recorded under application of sodium acifluorfen 16.5% + clodinafop propargyl 8% EC (premix) @ 165 + 80 g a.i. ha-1 at 20 DAS (1.61) followed by application of imazethapyr 3.75% + propaquizafop 2.5% ME (premix) @ 50 + 75 g a.i. ha-1 at 20 DAS (1.54).en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810178799
dc.keywordsSoybeanen_US
dc.language.isoEnglishen_US
dc.pages129en_US
dc.publisherCOLLEGE OF AGRICULTURE, UMMEDGANJ, KOTAen_US
dc.research.problemStudy on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]en_US
dc.subAgronomyen_US
dc.themeStudy on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]en_US
dc.these.typeM.Scen_US
dc.titleStudy on Comparative Efficacy of Herbicidal Weed Control in Soybean [Glycine max (L.) Merrill]en_US
dc.typeThesisen_US
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