Effect of integrated weed management practices on growth, yield and economics of aerobic rice
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Date
2013
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Rajendra Agricultural University, Pusa (Samastipur)
Abstract
A field experiment entitled “Effect of integrated weed management practices on growth, yield and economics of aerobic rice.” was carried out at the Agricultural Research Farm, Rajendra Agricultural University, Pusa, Samastipur, Bihar (India), during kharif season of 2012. The soil of the experimental field was clay loam in texture. It was moderately fertile being low in organic carbon (0.32 %), available nitrogen (249 kg N ha-1), phosphorus (16.86 kg P2O5 ha-1) and potassium (120 kg K2O ha-1). The soil was alkaline in reaction (pH 8.4).
The experiment was conducted with fourteen weed management treatments in RBD replicated thrice. Rice variety “Rajendra Suwasani” was taken as a test crop with RDF 130-68-58 kg N-P2O5-K2O/ha.
Among different weed management practices under aerobic condition, hand weeding twice at 20 and 40 DAS registered the maximum growth, yield attributes and yield of aerobic rice. The highest grain yield (39.47 q ha-1) was recorded with hand weeding twice at 20 and 40 DAS and lowest under weedy check (17.34 q ha-1). Similar trend was observed in straw yield. Among different combination of herbicides, application of pretilachlor 1 DAS fb azimsulfuron 20 DAS was the best combination and comparable with hand weeding.
Maximum weed control efficiency and weed control index were recorded under treatment hand weeding twice at 20 and 40 DAS and minimum under weedy check. However, weed population and weed dry weight were found maximum under weedy check and minimum with hand weeding twice at 20 and 40 DAS.
Maximum net return ( 29251/ha) and B:C ratio (1.15) was obtained in the treatment where pretilachlor (pre emergence) fb azimsulfuron (post emergence) was applied.
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