What are the effects of cold dew wind on late rice and its defense countermeasures?

Cold dew wind refers to a kind of low-temperature chilling injury in September and June of 65438+1October. The cold air in the north goes south, and the temperature in Jianghuai and its south area drops obviously, which inhibits the normal growth and metabolism of pollen grains, makes them unable to develop normally, and leads to empty shells and shriveled grains, resulting in reduced production. In the middle and lower reaches of the Yangtze River, it is generally called autumn low temperature; In Guangdong, Guangxi, Fujian and other places, it is called cold dew wind because it is around the solar terms. Measures to prevent cold dew wind are as follows:

(1) Grasp the occurrence law of cold dew wind, the safe heading date, the results of cold dew wind forecast and cold air forecast in that year, reasonably match varieties, and put forward the appropriate sowing and planting date to make them heading safely and avoid the harm of cold dew wind.

(2) In rice field management, agricultural measures should be taken to control the amount and time of fertilization, promote early maturity and avoid the harm of cold dew wind to rice.

(3) When the cold dew wind comes, emergency measures can be taken, such as: night irrigation and daily deep-water drainage and heat preservation, phosphorus spraying, root fertilization, smoking, application of warming agent and other measures.