With five rice cultivars as entries, the yields, grain filling characters, and physiological characters during the period of grain filling were studied, and the relationships between different characters were analyzed. The results showed that the yield differences among rice cultivars reached significant level. The yields of Liaojing 294, Liaoyou 20, Liaojing 326 and Shendao 3 were higher than that of Oou 316, Shendao 3, Liaojing 294 and Liaoyou 20 filled synchronously in superior and inferior grains and Oou 316 and Liaojing 326 filled asynchronously. There were apparent differences between the superior and inferior grains in terms of initial filling power, maximum filling rate and mean filling rate. There also existed differences in the seeds＇ filling rate and grain plumpness between rice varieties or between different grain positions in the same cultivar. The cultivars with synchronous filling property filled rapidly and got plump grains, but the situations of cultivars with asynchronous filling property were the opposite.
Research of Agricultural Modernization