施氮量与栽插苗数对杂交早稻“鄱优364”产量的影响

为探明施氮量和栽插苗数对新型杂交早稻新品种"鄱优364"产量形成的影响,在16.67 cm×20 cm同一栽插规格下,探讨其不同施氮量(0,120,150,180,210 kg/hm25个水平)和栽插苗数(2,3,4根/穴3个水平)下产量及其构成等指标的差异性。结果表明:施氮量对产量、有效穗数、每穗粒数、结实率和千粒质量具有极显著影响,纯氮为210 kg/hm2时,增穗、增产效果均不明显,反而降低了每穗粒数和结实率;随着栽插苗数增加,产量和有效穗数也随之增加,每穗粒数随之降低,结实率和千粒质量呈降低趋势;施氮量和栽插苗数互作对产量、每穗粒数、结实率和千粒质量有极显著影响,随着施氮量和栽插苗数的增加,产量增加,然而每穗粒数、结实率和千粒质量随着施氮量和栽插苗数的增加而减少,对有效穗数无显著影响。施氮量180 kg/hm2结合栽插苗数4根/穴有利于"鄱优364"增产。

Effects of Nitrogen Application Amount and Planting Seedling Number on Yield of Hybrid Early Rice Poyou364

With the planting density of 16.67 cm × 20 cm the effects of nitrogen fertilizer levels (0,120, 150,180and 210 kg/ha 5) and seedling numbers(2,3,4 per hole)on the yield were studied with new hybrid early rice of Poyou364.The results showed that the grain yield,effective panicle,grain number per panicle,seed setting rate and 1000-grain weigh were influenced significantly by nitrogen application. Seed-setting rate and 1000-grain weight decreased at 210 kg/ha of nitrogen level,but the panicle number and the grain yield did not increased significantly.With the increase of seedling number,the grain yield and effective panicle number increased,the grain number per panicle decreased,and the seed setting rate and 1000-grain weight showed a decreasing trend.The interaction of nitrogen application amount and seedling number had significant influence on the grain yield,grain number per panicle,seed setting rate and 1000-grain weigh. With the increase of the amount of nitrogen fertilizer and the number of planted seedlings, yield increased, but the grain number per panicle ,seed setting rate and 1000 grain weight decreased with the increase of the amount of nitrogen fertilizer and the number of planted seedlings had no significant effect on effective panicle.The higher yield of Poyou364 would be obtained with nitrogen application of 180 kg/ha,seedling number of 4 per hole.