Legume Research

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Legume Research, volume 37 issue 1 (february 2014) : 47-54

INFLUENCE OF POST EMERGENCE HERBICIDES ON WEEDS, NODULATION AND YIELDS OF SOYBEAN AND SOIL PROPERTIES

B.K. Jha, R. Chandra*, Rohitashav Singh
1Department of Soil Science, College of Agriculture G B. Pant University of Agriculture and Technology, Pantnagar - 263 145, India
Cite article:- Jha B.K., Chandra* R., Singh Rohitashav (2024). INFLUENCE OF POST EMERGENCE HERBICIDES ON WEEDS, NODULATION AND YIELDS OF SOYBEAN AND SOIL PROPERTIES. Legume Research. 37(1): 47-54. doi: 10.5958/j.0976-0571.37.1.007.

ABSTRACT

A field experiment was conducted at Pantnagar during kharif 2008 to examine the effect of post-emergence herbicides in soybean on productivity, weed infestation and soil health. Treatments consisting of clodinafop-propargyl 8% EC at 80, 100 and 165 g a.i. ha-1, Na-acifluorfen 20% SL of 165 and 206.2 g a.i. ha-1, combination of clodinafop-propargyl 8% EC + Na-acifluorfen 16.5% SL at 80 + 165, 100 + 206.2 and 160 + 330 g a.i. ha-1, imazethapyr 10% SL at 100 g a.i. ha-1, weed free and weedy check were tested in RBD with 3 replications. The soybean variety used for the study was PS-1347. Treatment of weed free check was found best by recording highest nodulation, yield and yield attributes, N uptake and soil parameters. It was at par with imazethapyr 10% SL @ 100 g a.i. ha-1, the treatment that showed highest nodule and plant dry weight, weed control efficiency, grain yield (1975 kg ha-1), straw yield (2445 kg ha-1), N uptake (136.4 kg ha-1 in grain and 40.9 kg ha-1 in straw), soil organic carbon, available N, P, K, microbial counts and dehydrogenase activity among different herbicides treatments. Clodinafop-propargyl 8% EC + Na-acifluorfen 16.5% SL was also found effective in weed control with 100 + 206.2 g a.i. ha-1. It was comparable to imazethapyr 10% SL @ 100 g a.i. ha-1 in weed index, weed control efficiency, nodule dry weight, grain and straw yields, N uptake, soil organic C, available N and K, microbial counts and dehydrogenase activity. The  highest net return of Rs. 39563 ha-1 was obtained with weed free check, which was at par with imazethapyr 10% SL @ 100 g a.i. ha-1 and Clodinafop-propargyl 8% EC + Na-acifluorfen 16.5 SL @ 100 + 206.2 g ai ha-1.

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