Efficacy of imazethapyr on weed dynamics, yield potential and economics of groundnut (<i>Arachis hypogaea</i>L.)

Singh, Smita; Kewat, M. L.; Dubey, Megha; Shukla, UN; Sharma, Janmejay

doi:10.5958/j.0976-0571.37.1.013

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“…Application of imazethapyr @ 0.15 kg ha -1 fb paraquat @ 0.4 kg ha -1 significantly reduced total weed density and dry biomass of weeds, which led to reduced weed competition for crop establishment at initial stages of crop growth (Table 3). This might be due to application of early and late post-emergence herbicide, which managed weed density quite well and reduce crop weed competition up to 50 days, resulting in vigorous crop growth (Ahmad et al, 2008;Singh et al, 2014). Application of pre-emergence pendimethalin @ 1.0 kg ha -1 fb imazethapyr @ 0.10 kg ha -1 at 30-35 DAS was found promising to control weeds in pigeonpea (Padmaja et al, 2013).…”

Section: Weed Interferencementioning

confidence: 99%

Effect of Weed Management on Weed Interference, Nutrient Depletion by Weeds and Production Potential of Long Duration Pigeonpea (Cajanus cajan L.) under Irrigated Ecosystem

Singh¹,

Singh²,

Singh³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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Timely weed management is important to increase productivity in s longduration crop like pigeonpea. A field study to evaluate the effect of weed management on weed interference, nutrient depletion by weeds and production potential of long duration pigeonpea under irrigated ecosystem was conducted at Agricultural Research Farm, IAS, BHU, Varanasi during 2009-10 and 2010-11. Results revealed that use of imazethapyr @ 0.15 kg ha -1 followed by (fb) paraquat @ 0.4 kg ha -1 40 days after sowing (DAS) significantly (P ≤ 0.05) reduced the weed density, total weed density and total weed dry weight being statistically at par with two hand weeding (HWs) at 25 and 50 days after sowing (DAS). Weed control index, weed persistence index and weed index were the highest in weed-free, 2-HWs and imazethapyr applied @ 0.15 kg ha -1 fb paraquat 0.4 kg ha -1 . However, weed-free treatment resulted in per cent higher yield attributes like pods plant -1 (32.0 and 29.5%), grains pod -1 (34 and 32.6%), 1000-grain weight (25.8 and 21.5%), grain yield (48.7 and 47.5%), gross returns (46.0 and 45.0%), net returns (54.6 and 53.0%) and benefit-cost ratio (40.7 and 38.5%), being significantly higher than weedy check but remained at par with 2-HWs, imazethapyr @ 0.15 kg ha -1 fb paraquat @ 0.4 kg ha -1 . The highest nutrient depletion by weeds was recorded in weedy check, whereas, the lowest was in imazethapyr @ 0.15 kg ha -1 fb paraquat 0.4 kg ha -1 .

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Section: Weed Interferencementioning

confidence: 99%