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Effect on summer black gram (Phaseolus mungo L.) to different sowing time and weed management practices with respect to yield, quality and nutrient uptake.

Abstract

An experiment was carried out on "Response of summer blackgram (Phaseolus mungo L.) to different sowing time and weed management practices" at AICRP on Irrigation Water Management, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist. Ahmednagar (Maharashtra) during summer season, 2015 The experiment was laid out in a factorial randomized block design with three replications. Eighteen treatment combinations consisting of three levels of sowing times and six levels of weed management practices. 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. Significantly the highest protein content in seed was found in weed free up to harvest but it was at par with treatments one hoeing at 20 DAS fb one hand weeding at 40 DAS and pendimethalin @ 1 kg ha-1 (PE) fb imazethapyr @ 75 g ha-1. Magnitude of N, P and K uptake in seed and stover was significantly maximum in 1st week of March sowing while uptake of nutrients by weeds was minimum in weed free up to harvest.