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选取了广东典型生态区的曲江、高要、广州、汕头和湛江5个代表性试验点进行地理分期播种试验,各试验点均采用3个主栽品种、设置6个播期,观测早稻不同发育期、测定其产量及其产量构成因子。结合附近气象站同期观测资料,采用数理统计和变异系数等方法,分析平均气温对早稻产量及产量构成因子的影响,确定了广东早稻高产不同生育期的适宜气温指标。结果表明:全生育期平均气温为23～24℃,其中出苗-分蘖期为18～21℃、分蘖-孕穗期为21～25℃、孕穗-齐穗期为24～28℃、齐穗-成熟期为27～30℃。
Five representative test sites of Qujiang, Gaoyao, Guangzhou, Shantou and Zhanjiang were selected for typical sowing experiment in Guangdong typical ecoregion. Three main cultivars were used in each experimental site, and six sowing dates were set. Developmental period, determination of its yield and yield components. Based on the observation data of the nearby meteorological stations in the same period, the effects of average air temperature on the yield and yield components of early rice were analyzed by using mathematical statistics and coefficient of variation. The suitable temperature index of high yield and early maturing rice in Guangdong was determined. The results showed that the average temperature during the whole growth period was 23 ~ 24 ℃, among which, the seedling-tillering stage was 18-21 ℃, the tillering-booting stage was 21-25 ℃, the booting-heading stage was 24-28 ℃, The period is 27 ~ 30 ℃.