Validation and delivery of improved technologies in the rice-wheat ecosystem in Bangladesh
2009
Khan, M.A.H. | Alam, M.M. | Hossain, M.I. | Rashid, M.H. | MolIah, M.I.U. | Quddus, M.A. | Miah, M.I.B. | Sikder, M.A.A. | Ladha, J.K.
Rice (Oiyza sativa L)-wheat (Triticum aestivum L.) is an important cropping system of Bangladesh. The plateauing of the productivity of this system in recent years is a major concern for attaining food self-sufficiency in the countly. Several on-farm validation and dissemination trials on resource-conserving technologies (RCTs)_leaf color chart (LCC)_aicied N management for rice (LCCN), reduced-till drill-seeded wheat by power tiller_operated seeder [RT-DSW (PTOS)], conventional-till puddled drum-seeded rice (CT-DrumR), integrated crop management (1CM) for rice, and crop diversification_were conducted at Chuadanga, Nashipur, and Gazipur sites, each composing one or more districts in Bangladesh, during 2005-08 to improve productivity and increase net returns of the rice-wheat system. All the RCTs except CT-DrumR proved to be superior to the farmers conventional practice in providing higher yields across seasons and years. Yield increased by 0.1_0,5 t ha, 0.4_1.0 t ha-, and O.70.8 t ha- for LCC-N, RT-DSW (PTOS), and 1CM, respectively. LCC-N also reduced N fertilizer use by 15_57 kg N ha-1. The yield in CT-DrumR was similar to that of conventional-till (puddled) transplanted rice (CT-TPR). Increases in net returns across seasons and years for LCC-N, 1CM, and CT-DrumR were US$41-75 ha-, $39_106 ha-1, and $54_60 ha-1, respectively, CT-DrumR needs further study with farmers to refine and improve the technology before large-scale delivery takes place, but RCTs such as LCC-N, RT-DSW (PTOS), and 1CM are ready for large-scale delivery and dissemination in the country.
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