Author(s):

Dr. Srinivasa Rao MMV, Dr. K Lakshmana and Dr. Roy GS

Abstract: Blackgram is major predominant crop during Rabi in Vizianagaram district of Andhra Pradesh, cultivated in an area of 40,000 ha, out of total cropped area of 75,273 ha with productivity of 250 kg/ha. Farmers grow crop by adopting traditional method of cultivation in rice fallow situation, before harvesting of paddy fields backgram seed broadcasted and crop is grown with residual soil moisture and nutrients. Among these factors, occurrence of weeds including re-growth of rice stubbles is one of the important factors during early stages as the weeds compete for scarce soil moisture and nutrients. Since, the black gram is sown under zero till condition, weed growth is severe and effectively competes with the crop. To manage the weeds and increase the yield of rice fallow blackgram, post emergence chemical weed management with Sodium Acifluorfen 16.5% and Clodinafop-propargyl 8% EC with dosage of 1000 ml/ha ensured effective control of both dicot and monocot weeds in black gram introduced by DAATT Centre, Vizianagaram District of ANGRAU, in collaboration with Department of Agriculture, Vizianagaram. Chemical weed management method is boon to farmers by controlling the weeds helps in increasing the availability of residual moisture and nutrient to Blackgram crops than normal method. DAATT Centre, Vizianagaram has organized On-Farm Demonstrations (OFDs) with help of Department of Agriculture, Vizianagaram in 6 locations randomly covering entire district in Rabi, 2015-16 and Rabi, 2016-17. Grain yield increase was achieved to a tune of 31.34% in Chemical weed management method (714 kgha^-1) over normal method of cultivation (544 kgha^-1). The increase in grain yield could be attributed reduction in weeds helped in more availability of nutrients and moisture which intern increase in yield attributes and yield.

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