Intergated Weed Management In Pigeonpea+Soybean Intercroping System
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Date
1996
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Birsa Agricultural University, Ranchi
Abstract
Studies on integrated weed management in pigeonpea + soybean intercropping system were conducted during rainy (kharif) season of 1994-95 in Ultipaleustalf-Red loam soil (belonging to the Red-Yellow-Light-Grey catenary soil Asso ciation Group representing major soil group of Chotanagpur plateau) of Birsa Agricultural University Farm, Ranchi. The experiment was laid out in a randomised block design with three replications and fifteen treatments consisting of un weeded control, weed free check, stalebed preparation, one hand weeding (30 DAS), two hand weedings (30 and 60 DAS), Pre-emergence application of pendimethalin 1 kg/ha and 2 kg/ha, metolachlor 1 kg/ha and 2 kg/ha, Alachlor 1 kg/ha and 2 kg/ha, pendimethalin e 1 kg/ha + one hand weeding, alachlor 1 kg/ha + one hand weeding, metolachlor @ 1 kg/ha + one hand weeding and pendimethalin @ 1 kg/ha + alachlor 1 kg/ha. The recommended dose of 20 kg N, 40 kg P205 and 20 kg K₂0/ha was applied both in pigeonpea and soybean crops in the form of urea, single superphosphate and muriate of potash, respectively.
The results of experiment revealed that among the different weed management treatments, weed free check produced maximum pigeonpea equivalent grain yield (24.8 q/ha), followed by pre-emergence application of pendimethalin 1 kg/ha + one hand weeding (21.5 q/ha) and two hand weedings (19.1 q/ha) resulting in per cent increase in pigeonpea equivalent grains yield of 191.8, 152.9 and 124.7, respectively over unseeded control.
Maximum net return (Rs 18,682/ha) and benefit : cost ratio (3.09) was obtained by weed free check. This was followed by pre-emergence application of pendimethalin 1 kg/ha + one hand weeding (net return of Rs 15,525/ha and benefiticost ratio of 2.59) and two hand weedings (net return of Ra 13,200/ha and benefit cost ratio of 2.23).
Pre-emergence application of pendimethalin @ 1 kg/ ha + one hand weeding had wider weed control efficiency (%) and weed suppression effect (%). This was followed by the treatment two hand weedings (30 and 60 DAS).
Highest nitrogen (245.7 kg N/ha), phosphorus (30.6 kg P20/ha) and potassium (111.4 kg K₂0/ha) uptake were re corded by weed free check, followed by the pre-emergence application of pendimethalin 1 kg/ha + one hand weeding (202.4 kg N, 25.3 kg P205 and 91.4 kg K20/ha, respectively) and two hand weedings (187.4 kg N, 21 kg P205 and 78.4 kg K₂0/ ha, respectively).