以超级稻桂两优2号为供试品种,设5个种植密度研究不同密度下桂两优2号的群体质量。结果表明,种植密度较大有利于植株抽穗期前叶面积指数提高、干物质及氮素积累,因而够苗快,茎蘖数峰值出现早,有效穗数多;但成熟期的叶面积指数、干物质积累量、氮素积累量及产量以中低密度(基本苗密度为54万苗/hm2)处理为好。 The super rice Guiliangyou 2 was used as the tested varieties, and five planting densities were used to study the population quality of Guiliangyou 2 under different densities. The results showed that higher planting density was beneficial to the increase of leaf area index, accumulation of dry matter and nitrogen before heading stage, which resulted in the emergence of seedlings faster and tillering peak number appeared earlier and more effective panicles. However, the leaf area index, Dry matter accumulation, nitrogen accumulation and yield were better at mid-low density (basic seedling density of 540,000 plants / hm2).