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关于播种期杂交水稻对温度反应敏感,抽穗扬花期气温不宜,对授粉灌浆影响极大。因此,杂交水稻作晚稻栽培,首先应考虑适时播种,安全抽穗的问题。1977年,我们根据76年杂交水稻在不同抽穗期的不同气温条件下,其结实率及产量情况,结合我县历年气温资料分析,认为9月20日前为我县杂交晚稻的安全抽穗期,6月20—25日为适宜的播种期。实践的结果,这个分析是正确的。去年9月21日开始,连续6天日平均气温低于24℃,其中3天低于23℃,北风3—4级,相对湿度低
On the sowing date of hybrid rice sensitivity to temperature, flowering and flowering temperature is inappropriate, pollination grouting great influence. Therefore, the hybrid rice for late rice cultivation, should first consider timely sowing, safe heading. In 1977, based on the seed setting rate and yield of 76-year hybrid rice at different temperatures at different heading stages, combining with the historical records of temperature in our county, we concluded that the safety heading date of hybrid late rice before September 20 was 6 Month 20-25 for the appropriate sowing period. The result of practice, this analysis is correct. Starting from September 21 last year, the average daily temperature for 6 consecutive days was below 24 ℃, of which 3 days were below 23 ℃, while the north wind was 3-4 and the relative humidity was low