晚稻寒露风气象灾害指标试验研究

利用人工气候箱在晚稻抽穗初期进行低温控制试验,通过考察晚稻的抽穗进程、叶片叶绿素含量和稻谷空壳率的变化,研究了晚稻寒露风的气象灾害指标。结果表明:15~18℃处理1~3 d或19~22℃处理2~5 d对晚稻叶片的叶绿素含量无影响;遭受15~18℃1 d的冷害为轻度,15~18℃2 d以上的冷害为重度;19℃2 d以上的冷害为重度;20℃2~4 d的冷害为中度,20℃5 d以上的冷害为重度;21~22℃2~4 d的冷害为轻度,21~22℃5 d以上的冷害为重度。

Experimental Study on Meteorological Indexes of Cold Dew Wind Injury to Late Rice

The meteorological indexes of cold dew wind injury to late rice were studied by treating rice plants at early heading stage with low temperature in artificial climate chamber , and by investigating the heading course , leaf chlorophyll content and rate of unfilled grains of the treated late rice in field .The results showed that 15-18℃treatments for 1-3 days or 19-22℃treatments for 2-5 days had no significant influences on the leaf chlorophyll content of late rice ;the cold damage caused by 15-18℃treat-ments for 1 day was slight , that did by 15-18 ℃treatments for 2 days or over 2 days was serious;the cold damage caused by 19℃treatments for 2 days or over 2 days was serious;that did by 20 ℃treatments for 2-4 days was moderate , by 20℃treatments for 5 days or over 5 days was serious , by 21-22 ℃treatments for 2-4 days was slight , and by 21-22 ℃treatments for no less than 5 days was serious .