Effect of weed management practices on weed dynamics and yield in black gram (Phaseolus mungo)

Abstract

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).