【目的】比较分析甬优系列籼粳杂交稻氮素吸收利用与转运特征,从氮素层面阐明甬优系列籼粳杂交稻高产形成特征。【方法】2013~2014年,选用7个甬优系列籼粳杂交稻组合为试验材料,以2个常规粳稻品种和2个杂交籼稻品种为对照,比较研究甬优系列籼粳杂交稻主要生育时期植株含氮率、氮素积累量,不同生育阶段氮素积累量与吸收速率,抽穗期和成熟期各器官的含氮率和氮积累量所占比例,抽穗至成熟期各器官间的氮素转运,以及氮素利用效率等特征。【结果】甬优系列籼粳杂交稻抽穗期植株含氮率和氮积累量分别为1.47%、202.67 kg/hm~2,成熟期植株含氮率与氮积累量分别为1.31%、257.23 kg/hm~2,极显著大于对照类型。甬优系列籼粳杂交稻氮素最大阶段性积累量为107.63 kg/hm~2,所占比例为41.84%,最大吸收速率为2.73kg/(hm~2·d),且均出现在拔节至抽穗阶段,杂交籼稻出现在移栽至拔节阶段。甬优系列籼粳杂交稻抽穗期茎鞘和叶的含氮率分别为1.19%和2.34%,成熟期分别为0.75%和1.58%,高于对照类型。甬优系列籼粳杂交稻抽穗期茎鞘和叶氮积累量所占比例分别为43.92%和43.87%,成熟期分别为16.44%和17.44%,极显著大于杂交籼稻。甬优系列籼粳杂交稻氮素转运量大,表观转运率和转运贡献率不高,抽穗后的氮素净积累量贡献率为32.06%,显著大于对照类型。甬优系列籼粳杂交稻百公斤籽粒吸氮量为2.29 kg,极显著大于杂交籼稻;氮肥偏生产力为37.54 kg/kg,极显著大于常规粳稻;氮素籽粒生产效率、氮素干物质生产效率和氮素收获指数偏低。【结论】甬优系列籼粳杂交稻总吸氮量大,在拔节期足量氮素积累的基础上,提高了拔节至抽穗期与抽穗至成熟期两个阶段的氮积累比例;抽穗至成熟期茎鞘和叶的氮素转运量大,但表观转运率与表观转运贡献率低,抽穗后氮素积累优势明显,氮素净积累量贡献率高,满足了灌浆期籽粒对氮素的需求。 【Objective】 The objective of this study was to compare and analyze the characteristics of nitrogen uptake and utilization of the indica-japonica hybrid rice of Yongyou series and to elucidate the characteristics of high-yielding yield of the Yongyou series of indica-japonica hybrid rice from the nitrogen level. 【Method】 Seven combinations of indica-japonica hybrid rice combinations of Yongyou series were selected as experimental materials in 2013-2014. Two conventional japonica rice varieties and two hybrid indica rice varieties were compared to study the main growth stages of the japonica-japonica hybrid rice of Yongyou series. Nitrogen accumulation rate, nitrogen accumulation, nitrogen accumulation and absorption rate in different growth stages, nitrogen and nitrogen accumulation in organs at heading and maturity stages, nitrogen contents in organs at heading to maturity Transport, and nitrogen utilization efficiency and other characteristics. 【Result】 The results showed that the N accumulation rate and N accumulation rate of heading and heading stages of the hybrid rice combination Yongyou were 1.47% and 202.67 kg / hm ~ 2, respectively. The nitrogen and nitrogen accumulation rates of maturing plants were 1.31% and 257.23 kg / hm ~ 2, significantly more than the control type. The maximum accumulation of nitrogen in the japonica-japonica hybrid rice was 107.63 kg / hm 2, accounting for 41.84% of the total. The maximum absorption rate was 2.73 kg / (hm -2 · d) At the heading stage, hybrid indica rice appeared from transplanting to jointing stage. The nitrogen rates of stem, sheath, and leaf of the hybrid rice combination Yongyong were 1.19% and 2.34% at heading and 0.75% and 1.58% respectively at maturity, which were higher than those of the control. The percentage of stem-sheath and leaf nitrogen accumulation in the Yongyou series of indica-japonica hybrid rice was 43.92% and 43.87% at the heading stage and 16.44% and 17.44% at the mature stage, respectively, significantly higher than that of the indica hybrid rice. The results showed that there was a large amount of nitrogen translocation between the indica-japonica and japonica hybrid rice lines of Yongyou series. The apparent translocation rate and the contribution rate of translocation were not high. The net nitrogen accumulation rate after heading was 32.06%, significantly higher than that of the control. Nitrogen absorption rate per 100 kg of Yongyou series indica / japonica hybrid rice was 2.29 kg, significantly higher than that of indica hybrid rice. The partial productivity of nitrogen fertilizer was 37.54 kg / kg, which was significantly greater than that of conventional japonica rice. Nitrogen production efficiency, nitrogen dry matter production efficiency And nitrogen harvest index is low. 【Conclusion】 The results showed that the total nitrogen uptake of the indica-japonica hybrid rice in Yongyou series was large. Based on the accumulation of adequate nitrogen at jointing stage, the nitrogen accumulation rate in two stages from jointing stage to heading stage and heading stage to mature stage was increased. The heading to maturity N translocation in the stem, sheath and leaf stage was large, but apparent transport rate and apparent transport contribution rate were low, nitrogen accumulation had obvious advantages after heading, the net contribution of nitrogen accumulation was high, The demand.