Abstract: Ten super rice varieties and ten super-high-yield rice varieties were pot-cultured under two levels of N supply（10 kg/667 m2 and 15 kg/667 m2） to determine their dynamic of tiller, the leaf area per plant, the leaf SPAD values, dry matter weight, grain yield, yield components and some other agronomic traits. Nitrogen efficient rice varieties and N inefficient rice varieties were preliminary selected according to the grain yield, and then analyzed the dynamic of tillers and dry matter accumulation. The results showed that the grain yield under high N levels were significantly higher than low N level. Five nitrogen efficient rice varieties and eight N inefficient rice varieties were selected. The dry matter weight of N efficient rice varieties were significantly higher than N inefficient rice varieties, the difference of tiller number was not significant during the whole growth period.

Key words:  rice, nitrogen efficiency, varieties, selection

摘要： 在盆栽条件下，设计施氮量10 kg/667 m2和15 kg/667 m2两个水平，以10个超级稻和10个超高产籼稻品种为供试材料，测定水稻不同时期茎蘖动态、单株叶面积、叶片SPAD值、干物质积累、单株产量及其构成因素等农艺性状，根据产量和产量增幅大小初步筛选出氮高效品种和氮低效品种，并且比较它们的茎蘖动态和干物质积累情况。研究结果表明，高N水平下各品种产量均显著大于低N水平；Ⅱ优602、两优6326、Y两优2号等6个品种为氮高效品种，新两优6号、Y两优1号、春光1号等8个品种为氮低效品种；整个生育期过程中氮高效品种的干物质积累量显著大于氮低效品种，茎蘖数差异不显著。

关键词: 水稻, 氮高效, 品种, 筛选