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

Abstract

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 .

Relevance of fertigation on tomato (Solanum lycopersicum) under polyhouse

“…This might be due to enhanced supply of nitrogen, phosphorus and potassium in the root rhizosphere which increases the uptake of nutrients that enhanced luxurious growth of crop which helps to absorb more photosynthetically active radiation (PAR) accompanied with increased yield attributes. These results are in the line of Hasan et al (2014) and Singh et al (2015).…”

Effect of Herbicide Application on Weed Dynamics in Pigeon Pea Based Cropping System under Rainfed Situations of Madhya Pradesh

“…The significantly lowest weed population in pigeon pea were recorded in the application of pendimethalin @ 0.75 kg a.i./ha PE + 1 HW after 50 DAS followed by oxyfluorfen @ 100g a.i./ha PE + 1 HW 50 DAS [10]. The significantly reduced weed density in pigeon pea when pendimethalin was applied@ 0.75 kg a.i./ha (PE) over control [11].…”

Investigating the Effectiveness of Various Weed Control Methods to Reduce Narrow and Broad Leaf Populations in the Oat (Avena sativa L.) Crop

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