水稻不实粒年年发生。不同年份不实率大不一致。在陕南正常年份有5—10％左右。不良年份如1952年,出穗期秋雨连棉,气温降低(18℃),云南白一般秕率最高达到50％以上;1953年开花结实期气温高达37.5℃以上,相对湿度降低至40％左右,而且多狂风,不实粒及半饱粒百分率胜利秈高达23％以上。影响结实的相关性因素很多,为分析各种因素的作用,掌握其发生规律,本站曾进行了一些观察和研究,兹分述如下: Paddy grains occur annually. Different years, different rates of large inconsistencies. In the normal years in southern Shaanxi 5-10%. In 1952, when the autumn was cold at the heading stage, the temperature was reduced (18 ℃) and the average rate of Yunnan white reached 50% or more. In 1953, the temperature reached as high as 37.5 ℃ in flowering and fruiting period and the relative humidity decreased to about 40% And more wild wind, unreal grain and half-grain percentage of victory Indica as high as 23%. Affect the strong correlation of many factors, in order to analyze the role of various factors, to grasp the law of its occurrence, this site has conducted some observations and studies, are as follows: