Yields and Nutrient Acquisition by Crop and Weeds Under Different Crop Establishment Methods and Weed Management Practices of Direct Seeded Rice

摘要

A field investigation was conducted during the kharif season of 2011 and 2012 to study the effect of crop establishment methods and weed management practices on nutrient acquisition by crop and weeds and soil properties in direct seeded rice (DSR). Bed and no-till planting were equally effective in reducing nutrient (NPK) depletion by weeds than conventional planting. However, there was no significant difference among them in terms of grain and straw yield. Also, bed and no-till planting increased total nutrient (NPK) uptake than conventional planting. No-till had highest partial factor productivity of nutrients. Brown manuring oidhaincha at 25 DAS by 2, 4-D 0.50 kg/ha along wimeimer pendimethalin @ 1.0 kg/ha alone or in combination with bispyribac-sodium 0.025 kg/ha significantly suppressed nutrient depletion by weeds. Increment in grain and straw yield in pendimethalin fb brown manuring and pendimethalin fb bispyribac-sodium fb brown manuring was in the tune of 187.67 and 188.36%, and 45.11 % and41.19% over weedy check, respectively. Similarly, integration of two or more weed management practices enhancedtotal nutrient (NPK) uptake and partial factor productivity of nutrients by direct seeded rice.