A field investigation was carried out during Kharif season in 2010 at Agronomy Department Farm,Dr.Panjabrao Deshmukh Krishi Vidyapeeth, Akola, to evaluate the effect of four herbicides (imazethapyr, pendimethalin,fenoxyprop-p-ethyl and quizal ofop -p-ethyl ) applied at different rates with different time of application (pre-emergence,post emergence and combination of both) and cultural practices onyield and yield contributing parameters of black gram (Phaseolus mungo). Data revealed that different chemicals and cultural weed control practices were exhibited their superiority over weedy check and reduced the crop weed competition by controlling the annual and broad leaved weeds. Among all the weed control treatments, pre-emergence application of pendimethalin @ 1.5 kg/ha showed higher grain weight plant-1 (4.87), number of pods plant (16.27),number of seeds per pod (7.00) and yield per ha (10.05).
The results of the field experiment carried out during kharif season of 2010 at agronomy department farm, Dr.P.D.K.V.,Akola revealed that N,P,K uptake by black gram (Phaseolus mungoL.) and weeds were significantly higher under weed free and weedy check treatments among all of the weed control treatments. The experiment was laid out in Randomized Block Design replicated three times with thirteen treatments, in that chemical and cultural treatments were compared with weedy check and weed free control. Herbicide application in general and pre-emergence application of pendimethalin @1.5kg/ha in particular reduced the nutrients removal by weeds and enhanced the nutrient uptake by the crop followed by cultural practices of two hand weeding at 15 & 30 days after sowing. The pre-emergence application of pendimethalin in @ 1.5 kg/ha recorded highest nutrient uptake in grain (34.92, 6.50, 34.16 NPK kg/ha resp.) and strover (63.26, 10.60, 57.60 NPK kg/ha resp.) among all the weed control treatment except weed free treatment. The crude protein content of grain was the highest with pre-emergence application of pendimethalin @ 1.5 kg/ha (21.65) followed by pendimethalin @ 1.0 kg/ha (21.55).
A field investigation was carried out during Kharif season in 2010 at Agronomy Department Farm, Dr.Panjabrao Deshmukh Krishi Vidyapeeth, Akola, to evaluate the effect of four herbicides (imazethapyr, pendimethalin, fenoxyprop-p-ethyl and quizalofop -p-ethyl) applied at different rates with different time of application (pre-emergence, post emergence and combination of both) and cultural practices i.e. hand weeding and hoeing on weed flora, growth and yield of black gram (Phaseolus mungo L.) .The experiment was laid out in randomized block design replicated three times with thirteen treatments in that chemical and cultural treatments were compared with weedy check and weed free control plots. The important predominant narrow leaved and broad leaved weeds observed were Cyperus rotundus, cyanodon dactylon, Poa annua, Echinochlora crusgalli, Denebra arabica, commelina benghalensis and Digera arvensis , Acalypha indica, Euphorbia geniculata, Phyllanthus niruri, Euphorbia hirta and Alysicarpus rugosus respectively. The results revealed that the application of Pendimethalin @ 1.5 kg a.i./ha as pre - emergence application recorded lowest weed dry weight (2.01), Higher Weed control efficiency (87.42), Lowest weed index (20.46) and significantly higher yield (10.02q/ha), followed by Pendimethalin @ 1.0 kg a.i./ha as pre-emergence application and twice hand weeding on 15 and 30 days after sowing (DAS).
A field investigation was carried out during Kharif season in 2010 at Agronomy Department Farm, Dr.Panjabrao Deshmukh Krishi Vidyapeeth, Akola,to evaluate the effect of four herbicides (imazethapyr, pendimethalin,fenoxyprop-p-ethyl and quizalofop -p-ethyl) applied at different rates with different time of application (pre-emergence,post emergence and combination of both) and cultural practices on weeds .The experiment was laid out in randomized block design replicated three times with thirteen treatments. The results revealed that the application of Pendimethalin @ 1.5 kg a.i./ha as pre-emergence application recorded lowest weed dry weight (2.01), Higher Weed control efficiency (87.42), Lowest weed index (20.46) and significantly higher yield (10.02q/ha),followed by Pendimethalin @ 1.0 kg a.i./ha as pre-emergence application and twice hand weeding on 15 and 30 days after sowing (DAS).Among all the weed control treatments, weed free treatment recorded highest (48410 Rs/ha and 35356 Rs/ha) gross monetary returns and relative net monetary returns in black gram. Pre-emergence application of pendimethalin @ 1.5 kg/ha(29368)as well as @ 1.0 kg/ha (29570) and post emergence application of fenoxyprop-p-ethyl @ 0.125 kg/ha (29502) followed by cultural practices of two hand weedings at 15 and 30 days after sowing (24607) were found effective in increasing the seed yield and relative net monetary returns of black gram. Benefit : cost ratio was observed highest under post-emergence application of fenoxyprop-p-ethyl @ 0.125 kg/ha(4.10) among all the weed control practices.
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