采用裂区设计,研究了氮肥用量和插植密度对杂交粳稻辽优5206生长和产量性状的影响,为北方粳稻高产高效栽培提供依据。结果表明,随着施氮量增加,水稻分蘖数、抽穗期干物质量、拔节期SPAD值、株高和穗长显著增加,有效穗数、穗粒数和产量虽增加但不显著;随着栽插密度的增加,水稻分蘖数、干物质量、有效穗数明显增加,灌浆期SPAD值、株高、穗长、穗粒数显著降低,抽穗期SPAD值、结实率和产量则先增后降;氮肥用量和密度在产量等多数性状上互作效应不显著;取得高产的最佳肥密组合是240 kg/hm²和16.7万丛/hm²。

The effects of nitrogen fertilizer amount and planting density on the growth and yield traits of japonica hybrid rice variety Liaoyou 5206 were studied by using a split zone design, providing a basis for high-yield and high-efficiency cultivation of northern japonica rice. The results showed that with the increase of nitrogen fertilizer amount, the tiller number, dry matter weight at heading stage, SPAD value at jointing stage, plant height and panicle length of rice increased significantly, while the effective panicles, grains per panicle and yield increased but not significant. With the increase of planting density, the tiller number, dry matter weight and panicle number increased significantly; the SPAD value at filling stage, plant height, panicle length and grains per panicle decreased significantly; the SPAD value at heading stage, seed setting rate and output increased first and then decreased. There was no significant interaction effect between nitrogen fertilizer and planting density on most traits such as yield. The best combination of nitrogen fertilizer amount and planting density for high yield was 240 kg/hm² to 167,000 clumps/hm².