近年来,辽宁稻区推广的许多品种单位面积穗数或粒数都有所提高,但普遍存在饱满粒率下降的趋势。据对七十年代以后辽宁稻区广泛种植的14个粳稻品种、杂交粳稻和新育成品系所进行的研究,其饱满粒率分布范围在36.3～77.9％,未能突破80％。即这些品种至少有20％以上的颖花形成空粒或秕粒,这无疑是光 In recent years, the number of spikes or grains per unit area of ​​many cultivars popularized in Liaoning rice area has been increased, but the rate of plumpness is generally decreasing. According to the researches conducted on 14 japonica varieties, japonica hybrids and newly-grown finished products widely planted in Liaoning Province since the 1970s, the full grain size distribution ranged from 36.3% to 77.9%, failing to exceed 80%. That these varieties at least 20% of the spike to form a hollow grain or grain, which is undoubtedly the light