Effect of Different Crop Establishment and Weed Management Practices on Yield, Yield Attributing Characters and Economies of Rice under Rainfed Conditions

摘要

Field experiment conducted during the kharifof 2011. The experiment was laid out in split-plot design with sixteen treatments in respect of its four main plots and four subplots. The main plots contain four different methods of rice establishment i.e.M (SRI), M, (Transplanting). M, (Line sowing) dry seeding and M_4 (Drum seeding), and the subplots contain four different type of weed management practices i.e. W: (Pyrazosulfuron-ethyl @ 20 g ha~(-1)), W, (Conoweeding). W (Two hand weeding) and W_4 (Weedy check), which were replicated thrice. "Pratikshya" was grown as the test variety of rice. The soil of the experimental site was sandy loam in texture with pH 5.45, EC (0.14 ds m~(-1)) medium in organic carbon (0.64%), low in available nitrogen (174.58 kgha~(-1)), but high in available phosphorus (40.626 kg ha~(-1)) and high in available potassium (312.54 kg ha~(-1)).In yield attributing characters highest length of panicle 26.37 cm and 26.4 cm, panicle weight of 6.63 g and 6.69 g, number of grains panicle-1 of 224 and 235, 1000 grain- weight of 22.6 g and 22.8 g. grain yield of 5.02 t ha~(-1) and 4.76 t ha"' were recorded in SRI and conoweeder respectively. While highest straw yields were recorded in SRI (5.81 ha~(-1)) and conoweeder (5.5 t ha~(-1)). The highest benefit: cost ratio were recorded in the SRI supplemented with conoweeder. Correlation studies is indicated that negative correlation steril-ity% with grain yield was observed. Panicle length, 1000's grain weight and harvest index was positively correlated with grain yield of rice at 1% level of significance.