早稻空秕率与抽穗开花期气象条件分析

Relationship between Sterile Grain Rate and Meteorological Conditions during Heading and Flowering Stage in Early Rice

为探讨早稻抽穗开花期气象因子对空秕率的影响，趋利避害，确保高产稳产，利用娄底农业气象观测站1981～2010年的早稻空秕率、发育期资料，以及娄底国家地面气象站的气象要素，分析早稻抽穗开花期光、温、水等气象条件与空壳率、秕粒率、空壳率＋秕粒率的相关性，选取相关性好的气象因子，阐述气象条件对空秕率的影响。结果表明：降水量、降水日数、日平均相对湿度、日最高气温是引起空秕率变化的主要气象因子。降水量、降水日数、日平均相对湿度与空秕率成正相关，日最高气温与空秕率成负相关。

In order to ascertain the effect of meteorological conditions during heading and flowering stage on sterile grain ratio in early rice, the correlations between meteorological conditions, sunshine, temperature and rainfall during heading and flowering stage, and percentage of unfilled grains, blighted grain rate and sterile grain ratio were analyzed utilizing the data on sterile grain ratio and growth duration of early rice from 1981 to 2010 from Loudi Agricultural Meteorological Sta- tion aml meteorological data from l,oudi National Meteorological Station. The results showed that the important meteorologi- cal conditions that induced change of sterile grain ratio were rainfall, rainy day, daily average relative humidity and daily maximum temperature. The correlations between sterile grain ratio and rainfall, rainy day, daily average relative humidity were positive, while correlation between sterile grain ratio and daily maximum temperature was negative.