预测水稻抽穗期对水稻安全生产和杂交育种工作起着非常重要的作用。应用AT-Tbase法(AT-accumu-lated effective temperature;Tbase-base temperature)预测水稻品种上育397的抽穗期。利用Tbase和有效积温,结合常年气象数据,可预测上育397在不同地区的安全抽穗期。当Tbase=9时,有效积温是597.2474℃,验证值与实际抽穗期的差异范围为-3~+3 d,预测值精确度最高。 Predicting the heading date of rice plays an important role in the safe production and crossbreeding of rice. The heading date of Yu397 on rice cultivar was predicted by AT-Tbase method (AT-accumu-lated effective temperature; Tbase-base temperature). Using Tbase and effective accumulated temperature, combined with perennial meteorological data, we can predict the safe heading date of Shangyou 397 in different regions. When Tbase = 9, the effective accumulated temperature is 597.2474 ℃. The difference between the validation value and the actual heading date ranged from -3 to +3 d, and the prediction accuracy was the highest.