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烤烟“日灼”是在生长发育期间因强日照照射后的高温,使叶片受到灼伤的现象。今年7月上、中旬,南昌地区持续晴天高温,7月1～20日,日平均气温30～34℃,极端最高气温超过40℃,且一直少云无雨,烈日炎炎,日照时间长。今年7月9、10、11日夏令时14时田间测定,照度都超过10万勒克斯。此时,正值烤烟上二棚叶和顶叶成熟,在本校烤烟试验田发现有大量烟株发生日灼现象。现将发生原因及补救措施报告如下。
Flue-cured tobacco “Sunburn” is the phenomenon that the leaves are burned due to the high temperature after strong sunlight irradiation during growth and development. In July and mid-July, Nanchang continued its sunny day with high temperatures. From July 1 to July 20, the average daily temperature was between 30 and 34 degrees centigrade. The extreme maximum temperature exceeded 40 degrees centigrade. There was less rain and no sun, hot sun and long sunshine. July 9, 10, 11 Daylight Saving Time at 14 o’clock in the field measured illuminance of more than 100,000 lux. At this point, at a time when the second shed on the flue-cured tobacco leaves and the top of the mature leaves, in our flue-cured tobacco trial found a large number of tobacco plant sunburn phenomenon occurs. Now the reasons and remedies are as follows.