【摘要】 [目的]研究施氮量对大穗型二系杂交水稻品种籽粒灌浆特性的影响。[方法]以2个大穗型二系杂交水稻品种培杂67和培杂88为材料,研究3种不同施氮水平(LN:90kg/hm2;MN:180kg/hm2;HN:270kg/hm)2对大穗型二系杂交水稻强弱势粒充实度和灌浆特性的影响。[结果]施氮量过高会降低弱势粒灌浆速率,延长灌浆时间,致使在叶片功能明显衰退后,弱势粒尚不能完成充实过程,造成弱势粒充实度下降;而施氮量过低则会降低弱势粒最大灌浆速率和平均灌浆速率,增大强、弱势粒之间平均灌浆速率的差异,从而造成弱势粒粒重和充实度下降。施氮量对强势粒充实度影响不大。[结论]该研究结果为氮肥的合理施用以及提高水稻产量和氮肥利用率提供了理论依据。更多还原

【Abstract】 [Objective] The aim was to research effects of N quantity on grain-filling characters of two-line hybrid rice cultivars with large ears. [Method] Peiza 67 and 88, two-line hybridized rice with large ears, were made use of to study on effects of N fertilizer in different quantities (LN: 90 kg/hm2;MN: 180 kg/hm2;HN: 270 kg/hm2) on plumpness and grain-filling characters. [Result] When N fertilizers were excessive, for inferior grains, grain-filling rate decreased and grain-filling time extended, resulting in plumpness decline after degradation of leaves’ function. When N fertilizers were inadequate, maximal and average grain-filling rates decreased and the differences between superior and inferior grains in grain-filling rate increased, leading to decline of grain’s weight and plumpness degree. On the other hand, quantity of N fertilizers had little effect on superior grains in plumpness. [Conclusion] The research provided references for reasonable use of N fertilizer and improvement of rice yield and N use.更多还原