Title: Yield, N uptake and economics of fodder sorghum and associated weeds as affected by different weed management practices.
Abstract: The experiment was carried out during Kharif season year 2001 and 2002, respectively, to study the yield, N uptake and economics of fodder sorghum (Sorghum bicolor (L.) Moench) and associated weeds as affected by different weed management practices, consisted of ten treatments viz. one hand weeding at 20 days after sowing (T1); one and half time seed rate 45 kg/ha (T2); Pendimethalin 1.0 kg/ha (T3); atrazine at 1.0 kg/ha PE (T4); alachlor at 2.0 kg/ha PE (T5); atrazine at 0.5 kg/ha PE + one hand weeding at 30 days after sowing (T6); atrazine at 0.5 kg/ha PE + 0.5 kg/ha at 10 days after sowing (T7); cowpea as intercrop (T8); weed free (T9) and weedy check (T10) tested in randomized block design with three replications. The sorghum crop was infested with Cyperus spp. (38.9%) and Echinochloa colona (28.0%) of major weeds and other weeds (33.1%), which reduced 75.00 and 43.98 per cent of green forage yield during both the years, respectively. Application of atrazine at 0.5 kg/ha PE + 0.5 kg/ha at 10 days after sowing significantly reduced lower weed population, dry weight and nitrogen uptake of weeds though at par with that of atrazine at 1.0 kg/ha PE, one hand weeding at 20 days after sowing and atrazine at 0.5 kg/ha PE+ one hand weeding at 30 days after sowing over other treatments in both the years. Application of atrazine at 0.5 kg/ha PE + 0.5 kg/ha at 10 DAS produced more plant height, dry matter accumulation per shoot, leaf area per plant which contributed more green and dry fodder yield and nitrogen uptake of the forage sorghum, being at par with that of atrazine at 1.0 kg ha−1 PE, one hand weeding at 20 DAS and atrazine 0.5 kg/ha PE + one hand weeding at 30 DAS but significantly higher than other treatments in both the years. Application of atrazine at 0.5 kg/ha PE + 0.5 kg/ha at 10 DAS recorded highest net returns (Rs.16085 and 19675/ha) and B:C ratio (2.26 and 2.19), followed by atrazine at 1.0 kg/ha PE, one hand weeding at 20 DAS and atrazine at 0.5 kg/ha PE + one hand weeding at 30 DAS over weedy check conditions (Rs. -270 and 7905/ha) and (−0.04 and 0.82) during both the years.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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