海南杂交早稻减产原因分析及最佳播种期选定

Analysis of Cause of Hybrid Early Rice Yield Decrease and Selection of Optimal Sowing Stage in Hainan Province

根据22a杂交早稻生育期农业气象观测资料,用相关普查的方法,分析了海南杂交早稻产量低下的原因。结果表明,相对气象产量与秧苗期寡照日数、秧苗期平均气温之间的相关性分别达到极显著和显著水平,复相关系数为0.6098(通过了置信度为0.05水平的显著性检验),说明秧苗期低温寡照是海南杂交早稻减产的最主要因素。因此,按趋利避害原则,当地应综合考虑早稻、晚稻和冬季瓜菜的生产,充分利用自然生态资源,选定早稻最佳播种期。

Based on the growing period data of early hybrid rice in the last 22 years, the causes of low yield of early hybrid rice in Hainan Province were analyzed by relative survey method. The result showed that the primary factors of yield reduction were low temperature and less sunshine in rice shooting stage. The correlative coefficient and multi-coefficient between increase rate and cloudy days and mean temperature of shoots were - 0.6094 and 0.4799 and 0.6098 at 0.01and 0.05 and 0.05 significant level respectively. Considering early rice, late rice and winter vegetable production chose the optimal sowing date.