Studies on effect of weed management practices on growth and yield of different rice varieties under aerobic rice system

Abstract

The experiment was laid out in a split-plot design with three replications and comprises two factors. Four weed management practices viz., weed-free up to 30 DAS (W1), weed-free up to 45 DAS (W2), weed-free up to 60 DAS (W3) and unweeded control (W4) in main plot and six rice varieties viz., ‘DRR Dhan-44’ (V1), ‘Sahabhagidhan’ (V2), ‘DRR Dhan-41’ (V3), ‘DRR Dhan-42’ (V4), ‘DRR Dhan-46’ (V5) and ‘HUR-3022’ (V6) in sub plots. The results showed that among weed management practices, weed-free up to 60 DAS (W3) which was at par with weed-free up to 45 DAS (W2) significantly enhanced growth attributes of rice, yield attributes, yield [grain and straw yield] and nutrient content and uptake as compared to weedy throughout the season (W4). And among cultivars significantly higher under DRR Dhan-44 (V1) which was at par with HUR-3022 (V6) and was minimum in DRR Dhan-46 (V5). Among different treatment combinations the minimum cost of cultivation and higher B:C ratio obtained under W2V1 (weed free up to 45 DAS + DRR Dhan-44) over others.