Based on the concept of the highest population productivity, the yield components and the characteristics of nitrogen absorption and utilization of three types of rice cultivars with low, medium and high level of the highest population productivities were investigated at their optimum nitrogen levels. With the increase of the highest population productivity, the total spikelet number increased remarkbly, while the seed setting rate and 1000grain weight showed no significant differences. The nitrogen accumulation at Nn, heading and maturing stages increased correspondingly as the productivities increased, whereas no significant difference was found at elongation. In order to analyze the nitrogen absorption progress of rice genotypes with different productivities, the whole growth duration was divided into four phases, i.e., from transplanting to critical stage of productive tillering, from critical stage of productive tillering to elongation, from elongation to heading, and from heading to maturing. Results indicated that, the nitrogen accumulation during each period increased typically as the productivity increased during all growth phases except the phase from critical stage of productive tillering to elongation.Compared with low productivity genotype, the nitrogen translocation amount and nitrogen translocation rate of mediumproductivity genotype increased evidently. However, there was negligible difference between medium and high productivity types. Based on the results above, it was concluded that rice cultivars with the highest population productivity were featured by rapid nitrogen absorption before Nn, slow nitrogen absorption from Nn to elongation, steady nitrogen absorption from elongation to heading, and massive nitrogen absorption from heading to maturing; and a large but not excessive amount of transferred nitrogen from stems and leaves after heading.
\[1\]Peng S B, Khush G S, Virk P, et al. Progress in ideotype breeding to increase rice yield potential. Field Crops Res, 2008, 108: 3238.
\[2\]吴桂成, 张洪程, 钱银飞, 等.粳型超级稻产量构成因素协同规律及超高产特征的研究. 中国农业科学, 2010, 43(2): 266276.
\[3\]李华,徐长青, 李世峰. 不同氮肥管理对机插水稻产量及氮肥利用的影响. 贵州农业科学, 2008, 36(5): 3941.
\[4\]李敏, 张洪程, 李国业, 等.水稻氮效率基因型差异及其机理研究进展. 核农学报, 2011, 25(5)：10571063.
\[5\]Singh U, Lagha J K, Castillo E G,et al. Genotypic variation in nitrogen use efficiency in medium and long duration rice. Field Crops Res, 1998, 58: 3553.
\[6\]Koutroubasa S D, Ntanosb D A. Genotypic differences for grain yield and nitrogen utilization in indica and japonica rice under Mediterranean conditions. Field Crops Res, 2003, 83: 251260.
\[7\]单玉华, 王余龙, 山本由德, 等. 不同类型水稻在氮素吸收及利用上的差异. 扬州大学学报：自然科学版, 2001, 4(3): 2126.
\[8\]单玉华, 王余龙, 山本由德. 常规籼稻与杂交籼稻氮素利用效率的差异. 江苏农业研究, 2001, 22(1): 1215.
\[9\]程建峰, 戴廷波, 曹卫星, 等. 不同类型水稻种质氮素营养效率的变异分析. 植物营养与肥料学报, 2007,13(3): 175183.
\[10\]张亚丽, 樊剑波, 段英华, 等.不同基因型水稻氮利用效率的差异及评价. 土壤学报, 2008, 45(2): 267273.
\[11\]Peng S B, Roland J, Buresh, et al. Strategies for overcoming low agronomic nitrogen use efficiency in irrigated rice systems in China. Field Crops Res, 2006, 96: 3747.
\[12\]Yoshiaki K, Hiroe Y, Jairo A,et al. N applications that increase plant N during panicle development are highly effective in increasing spikelet number in rice. Field Crops Res, 2011, 122: 242247.
\[13\]殷春渊,张庆, 魏海燕,等.不同产量类型水稻基因型氮素吸收、利用效率的差异. 中国农业科学, 2010, 43(1)：3950.
\[14\]马国辉, 龙继锐, 戴清明, 等. 超级杂交中稻Y两优1号最佳缓释氮肥用量与密度配置研究. 杂交水稻, 2008, 23(6): 7377.
\[15\]马群, 杨雄, 李敏, 等. 不同氮肥群体最高生产力水稻品种的物质生产积累. 中国农业科学, 2011,44(20)：41594169.
\[16\]马群. 水稻品种氮肥群体最高生产力及其增长因素的研究\[学位论文\]. 扬州大学： 扬州. 2011.
\[17\]魏海燕, 张洪程, 杭杰, 等.不同氮利用效率水稻氮素积累与转移的特性. 作物学报, 2008, 34(1): 119125.
\[18\]董桂春, 王余龙, 周娟, 等.不同氮素籽粒生产效率类型籼稻品种氮素分配与运转的差异. 作物学报, 2009, 35(1)：149155.
\[19\]单玉华, 王海候, 龙银成, 等.不同库容量类型水稻在氮素吸收利用上的差异. 扬州大学学报：农业与生命科学版, 2004, 25(1): 4145.
\[20\]董桂春, 于小凤, 董燕萍, 等.不同库容量类型常规籼稻品种氮素吸收与分配的差异. 中国农业科学, 2009, 42(10)：34323441.
\[21\]程建峰, 戴廷波, 荆奇, 等.不同水稻基因型的根系形态生理特性与高效氮素吸收. 土壤学报, 2007, 44(2)：266272.
\[22\]Fan J B, Zhang Y L, Turner D., et al. Root physiological and morphological characteristics of two rice cultivars with different nitrogenuse efficiency. Pedosphere,2010,20(4): 446455.
\[23\]樊剑波, 沈其荣, 谭炯壮, 等. 不同氮效率水稻品种根系生理生态指标的差异. 生态学报, 2009, 29(6): 30523058.
\[24\]Zhang Y L, Fan J B, Wang D S, et al. Genotypic differences in grain yield and physiological nitrogen use efficiency among rice cultivars. Pedosphere, 2009,19(6): 681691.
\[25\]江立庚, 曹卫星.水稻高效利用氮素的生理机制及有效途径.中国水稻科学, 2002, 16(3): 261264.
\[26\]程建峰, 蒋海燕, 刘宜柏, 等.氮高效水稻基因型鉴定与筛选方法的研究. 中国水稻科学, 2010, 24(2)： 6370.
\[27\]董桂春, 李进前, 张彪, 等. 高氮素籽粒生产效率类型籼稻品种的一些相关性状. 中国水稻科学, 2009, 23(3)： 289296.
\[28\]徐克章, 黑田荣喜,平野贡.水稻开花后叶片含氮量与光合作用的动态变化及其关系.作物学报, 1995, 21(2): 171175.
\[29\]金继运, 何萍.氮钾营养对春玉米后期碳氮代谢与粒重形成的影响. 中国农业科学, 1999, 32(4): 5562.
