Influence of Integrated Nutrient Management Practices on Yield Attributes and Yield of Wet Seeded Rice (Oryza saliva L.)-Cotton (Gossypium hirsutum L.) Cropping Sequence

摘要

To study the influence of integrated nutrient management practices on yield attributes and yield of wet seeded rice and cotton under sequential cropping system, afield experiment was conducted during rabi and summer season (Oct.-July) of 2001-02 at wetland of Central farm, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Killikulam (8° 48' N 77°42' E and 40m above mean sea level). The experiment was laid out in split - plot design with three replication. Integrated nutrient management practices to direct wet seeded rice were allotted to the main plots and nutrient management practices to succeeding cotton were assigned in the subplots. Eleven treatments were planned and executed in wet seeded rice viz., pre sowing of Sesbania aculeata @ 50 kg seeds ha~(-1), in situ incorporation at 45 DAS + 100 % RDF (150:50:50 Kg NPK ha~(-1)), pre sowing of Sesbania aculeata @ 75 kg seeds ha~(-1), in situ incorporation at 45 DAS + 75 % RDF (112.5: 37.5:37.5 Kg NPK ha~(-1)), intercropping of Sesbania aculeata @ 25 kg seeds ha~(-1) and incorporation at 40 DAS + 100 % RDF, intercropping of Sesbania aculeate @ 37.5 kg seeds ha~(-1) and incorporation at 40 DAS + 75 % RDF, GLM (Glyriddia) @ 6.25 t ha~(-1) +100 % RDF, GLM (Glyriddia) @9.75 t ha~(-1) + 75 % RDF, FYM @ 12.5 t ha~(-1) +100% RDF, FYM @ 18.75 t ha~(-1) + 75 % RDF, 100 % RDF alone (150:50:50 Kg NPK ha~(-1)), 75 % RDF alone (112.5: 37.5:37.5 Kg NPK ha~(-1)) and control. In residual cotton four nutrient management practices were adopted viz., 100% RDF (60:30:30 kg NPK ha~(-1)), 75 % RDF (45:22.5:22.5 kg NPK ha~(-1)), 50 % RDF (30:15:15 kg NPK ha~(-1)) and control. In wet seeded rice, treatment receiving FYM @ 125 t ha~(-1) + 150:50:50 kg NPK ha~(-1) registered significantlyhigher number of productive tillers (526 m~(-2)), number of filled grains panicle~(-1) (94,3), test weight (22.2 g), grain yield (5538 kg ha~(-1)) and straw yield (8693 kg ha~(-1)) than inorganic fertilizer alone and control and was on par with pre solving of Sesbania aculeata @ 50 kg seeds ha~(-1), in situ incorporation at 45 DAS +100 % RDF (150:50:50 Kg NPK ha~(-1)). In succeeding cotton, residual effect of application of FYM @ 12.5 t ha~(-1) + 150:50:50 kg NPK ha~(-1) to rice, significantly enhancedthe yield attributing characters viz., number of fruiting points plant~(-1) (30.8), number of bolls plant~(-1) (15.8), boll weight (2.94 g), seed cotton yield (1297 kg ha~(-1)) and stalk yield (2783 kg ha~(-1)). Similarly, direct effect of application ofinorganic fertilizer at 100 % RDF (60:30:30 kg NPK ha~(-1)) also significantly improved the number of fruiting points plant~(-1) (31.3), number of bolls plant1 (16.6), boll weight (3.12 g), seed cotton yield (1402 kg ha~(-1)) and stalkyield (2876 kg ha~(-1)) than lower levels of inorganic fertilizer application.