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中文摘要：
以杂交水稻品种陆两优996、两优培九商品种子为试验材料,以盐水溶液将种子精选分级为比重〈1.0（T1）、1.0-1.09（T2）、1.1-1.19（T3）、≥1.2（T4）不同组分,以未精选的种子（CK）为对照,研究了比重分级对种子发芽出苗、秧苗素质及产量等的影响。结果表明：种子精选分级后,处理T2、T3、T4下水稻种子的发芽率、发芽指数、活力指数、出苗率、成秧率都均不同程度的高于CK,T1处理则显著低于CK;与未分级的商品种子对照相比,T2、T3、T4处理均增产显著,增产的原因是单位面积有效穗数或者每穗总粒数的增加。
英文摘要：
Using the commercial seeds of two hybrid rice varieties including Lu- liangyou 996 and Liangyoupeijiu as the materials, four specific gravity-based seed grading treatments, Le., the specific gravity of 〈1.0 （T1）, 1.0-1.09 （T2）, 1.1-1.19（T3） and ≥1.2 （T4）, by selection with different saline solutions, and the control without seed grading （CK） were designed to study the effects of seed grading on seed germination, seedling emergence, seedling quality and grain yield. The results showed that the treatments of T2, T3 and T4 had higher or significantly higher seed germination rate, germination index and vigor index, seedling emergence rate and adult seedling rate than the CK, while T1 had significantly lower values of these traits than the CK. Compared with the CK, the number of spikelets per pani- cle was found to be the main reason for the yield increase of these treatments with high seed viability.
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