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Response of summer blackgram (Phaseolus mungo L.) to different sowing time and weed management practices.

Abstract

A field investigation on "Response of summer blackgram (Phaseolus mungo L.) to different sowing time and weed management practices" was conducted during summer season 2015 at AICRP on Irrigation Water Management, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist. Ahmednagar (Maharashtra). The experiment was laid out in a factorial randomized block design with three replications. Eighteen treatment combinations consisting of three levels of sowing times i.e. 3rd week of Feb. (16th February) (D1), 1st week of March (2nd March) (D2), 3rd week of March (17th March) (D3) and six levels of weed management i.e. Weedy check (control) (W1), weed free up to harvest (W2), pendimethalin @ 1 kg a.i. ha-1 (PE) (W3), pendimethalin @ 1 kg a.i. ha-1 (PE) fb imazethapyr @ 75 g a.i. ha-1 (PoE) at 20 DAS (W4), imazethapyr @ 75 g a.i. ha-1 (PoE) at 20 DAS (W5), one hoeing at 20 DAS fb one hand weeding at 40 DAS (W6). The predominant weed flora observed in the experimental plot were Cynodon dactylon, Cyperus rotundus, Digera arvensis, Parthenium hysterophorus, Euphorbia geneculata, Euphorbia thymifolia and Portulaca oleracea. Total weed count and weed dry matter was higher under 3rd week of March sowing and in weedy check. Weed control efficiency was recorded highest under 1st week of March sowing and in treatment one hoeing at 20 DAS & one hand weeding at 40 DAS. Weed index was recorded the highest under 3rd week of March sowing and in treatment weedy check. Sowing on 1st week of March (D2) recorded significantly the highest seed (11.04 q ha-1) and stover yields (14.40 q ha-1) of summer blackgram. Likewise weed free up to harvest treatment gave significantly highest seed (12.19 q ha-1) and stover yields (15.98 q ha-1) and was at par with one hoeing at 20 DAS fb one hand weeding at 40 DAS and pendimethalin @ 1 kg a.i. ha-1 (PE) fb imazethapyr @ 75 g a.i. ha-1 (PoE) at 20 DAS. The highest net monetary returns (Rs 25923) with B: C ratio (1.97) was obtained in 1st week of March sowing. Similarly the highest net monetary returns (Rs 28492) with B: C ratio (2.05) was obtained from treatment one hoeing at 20 DAS & one hand weeding at 40 DAS followed by pendimethalin @ 1 kg a.i. ha-1 (PE) fb imazethapyr@ 75 g a.i. ha-1 (PoE) at 20 DAS (Rs 27671) and B: C ratio (2.02) and treatment weed free up to harvest with net monetary returns (Rs 27785) and B: C ratio (1.92).