【摘要】 【目的】探究不同移栽密度与穗型品种对再生稻产量形成的影响。【方法】采用两因素裂区试验设计，以移栽密度为主区（D1:15万穴/hm~2、D2:18.75万穴/hm~2、D3:22.5万穴/hm~2、D4:26.25万穴/hm~2、D5:30万穴/hm~2、D6:33.75万穴/hm~2），品种为副区（TYHZ：多穗型品种天优华占、HLY898：穗粒数兼顾型品种徽两优898、YLY900：大穗型品种Y两优900）。【结果】品种类型和移栽密度对头季产量构成及周年产量均有显著影响，但不存在显著性交互作用。穗粒数兼顾型品种HLY898头季产量最高，产量因子之间协调能力强，结实率高，周年产量也最高，其次是多穗型品种TYHZ，头季分蘖能力强，成穗率高，有效穗数足，头季和周年产量均显著高于大穗型品种YLY900。大穗型品种YLY900头季群体生长速率快，穗粒数高，但是分蘖能力差，成穗率低，收获指数低，导致头季产量和周年产量均最低，显著低于其他类型品种。移栽密度以D5处理最佳，其头季和周年产量均最高，分蘖速度快，数量多，显著增加了头季有效穗数，提高了头季库容量、群体生长速率和干物质积累量，头季产量较其他处理显著增产，周年产量显著高于D1处理和D6处理。【结论】再生稻应选择穗粒数兼顾型和多穗型品种，依靠其分蘖成穗能力取得高产，移栽密度选择30万穴/hm~2，此模式下，头季分蘖能力强，群体生长速率快，库容量大，周年产量最高。更多还原

【Abstract】 【Objective】Transplant is a cultivation commonly used in ratooning rice production in southern China and other eastern Asian countries. Its impact on rice growth and yield depends on a range of factors. This paper presents an experimental study of the effect of transplanting density on yield composition of different panicle-typed varieties.【Method】The field experiment compared three rice varieties: Tianyou Huazhan, Huiliangyou 898 and Yliangyou 900. The transplanting density treatments for all three varieties were the same: 1.5×10~4 points/hm~2(D1),187 500 points/hm~2(D2), 225 000 points/hm~2(D3), 262 500 points/hm~2(D4), 300 000 points/hm~2(D5), and 337 500points/hm~2(D6). In the experiment, we measured rice growth and its ultimate yield formation in each treatment.【Result】Transplanting density affected composition of both seasonal and annual rice yields significantly, but the effect varied with rice varieties. There was a lack of variety-planting density interaction on the yield. The variety Huiliangyou 898 had the highest seasonal and annual yields, strong coordination ability among yield factors, high seed setting rate; variety Tianyou Huazhan had strong tillering ability, high ear-setting rate and full panicle numbers per unit area. All these were significantly higher than those of the variety YLY900. The variety YLY900 had fast population growth rate and high grain numbers per panicle, but its tillering ability was poor, and ear-setting rate and low harvest index were low; it hence produced the lowest seasonal and annual yields. On average, the optimal transplanting density for the three varieties was D5, producing highest seasonal and annual yields, faster tillering rate and more tillers per unit area; it also significantly increased the panicle numbers and sink capacity, population growth rate, and dry matter accumulation.【Conclusion】Selecting rice varieties with panicle and grain for the initial season in ratooning rice production should consider its tillering ability to achieve high yield. For the three rice varieties we compared, the optimal transplanting density is 300 000 holes/hm~2.更多还原