关于连作晚粳稻安全齐穗期的指标,提法很多,至今尚无统一的标准。本文拟通过对嘉兴县历年(1953～1974年)气象资料的分析,从秋季低温来临的迟早和秋季稳定通过20℃终日以后的回温程度两个方面来探讨连作晚粳稻安全齐穗期的气象指标。现就所得材料分析如下,仅供商榷。一、秋季低温来临的迟早与安全齐穗期的关系目前,对于影响连作晚粳稻抽穗开花和安全齐穗的秋季低温的指标,尚无统一的标准。本文拟采用通常气候统计中的日平均温 There are many references to the index of safe heading date even for the late japonica rice, so far there is no uniform standard. Based on the analysis of the meteorological data of Jiaxing County over the years (1953 ~ 1974), this paper attempts to explore the meteorological data of the safe heading stage of continuous late-season japonica rice from two aspects: the coming of low temperature in autumn and the returning of temperature after 20 ℃ index. Now the analysis of the following materials, for discussion only. First, the relationship between the sooner or later autumn cold and the safe heading date At present, there is no uniform standard for the index of autumnal low temperature affecting the heading and flowering and the safe heading of even late japonica rice. This article intends to use the average daily temperature in the climatological statistics