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南宁市地处我区南部,属亚热带气候,历史上为双季稻作区。但由于春秋季受北方冷空气或寒潮的影响,早稻播种育秧期间常有低温阴雨天气出现,造成烂秧;晚稻抽穗扬花时又易受到寒露风危害,产量不稳定。据试验和调查研究结果,以日平均温度≤12℃连续3天以上作为早稻烂秧的农业气象指标,以日平均温度≤21℃连续3天以上作为晚稻常规品种抽穗扬花期受寒露风危害的农业气象指标,我们统计分析了南宁市的气象历史资料看到:早春各旬出现烂秧天气的年份,2月中旬占64.5％,2月下旬占45.2％,3月上旬占32.2％,3月中旬占25.8％,3月下旬占12.9％,严重的倒春寒
Nanning City is located in the southern part of our region, is a subtropical climate, the history of double cropping area. However, due to the impact of cold air or cold wave in northern China during spring and autumn, cold and rainy weather often occurs during early sowing and sowing seedlings, resulting in rotten seedlings. Late heading and flowering are vulnerable to cold and dew winds and the yield is unstable. According to the results of the experiment and investigation, taking the daily average temperature ≤12 ℃ for more than 3 days as the agricultural meteorological index of early rice rotten seedlings, the average daily temperature ≤21 ℃ for more than 3 days was used as the common variety of late rice at heading and flowering stage. Meteorological indicators of agriculture, we have a statistical analysis of historical data of Nanning City, see: rotten seedlings in early spring ten years of weather, accounting for 64.5% in mid-February, 45.2% in late February accounted for 32.2% in early March, March 25.8% in the middle, 12.9% in late March, a serious late spring cold