Tolerance to low N-fertilized level for rice germplasm and coefficient correlation among grain weight per plant and its response index to nitrogen and main agronomic traits were analyzed.

• 结果表明，水稻种质资源的耐低氮能力在不同施氮水平间均有较大差异，多数农艺性状的表型差异顺序为未施氮＞施低氮＞普通施氮；