Late rice is most afraid of cold dew wind. How to prevent cold dew wind?

On 20 17 10/8 17, people will welcome the annual cold dew solar term. Before and after the cold dew solar term, farmers and friends who planted late rice in South China began to get nervous, in order to prevent a common meteorological disaster-"cold dew wind" from bringing losses to late rice in South China. So today, the old calendar will introduce you to the method of preventing cold dew wind with rice.

Late rice is most afraid of "cold dew wind"

Cold dew wind is a kind of low-temperature chilling injury that causes the local temperature to drop obviously after the invasion of cold air in autumn. Cold dew wind is the most common main meteorological disaster affecting late rice production in southern China. As long as the cold dew wind blows, the flowering, pollination, fertilization and filling of late rice will be affected, the number of grains per ear will increase and the seed setting rate will drop greatly. In places with severe cold dew wind, it may even lead to "withering" of late rice. In the Yangtze River valley of our country, there is a farmer's proverb that "before the autumnal equinox, cut it and feed it to the old cow".

The cold dew wind is mainly caused by the cold air from the north going south. When autumn comes, the frequency and intensity of cold air activities increase, and the temperature drops to form a cold dew wind. There are two kinds of cold dew wind: first, the cold air is very strong, which drives straight from the north, and is characterized by dry and cold, obvious cooling, dry air, strong wind force and large temperature difference between day and night; Second, when the cold air in the north went south, it met the warm and humid airflow that gradually weakened in the south. When cold and warm air confront each other and there is enough water vapor, low temperature and rainy weather appears. These two kinds of weather are the enemies of late rice.

Prevention of cold dew wind

Irrigation should be carried out immediately before the cold dew wind comes to avoid heat loss in rice fields and slow down the cooling process. Generally, the irrigation depth is 7 ~ 10 cm, and the drainage should be carried out gradually after the cold dew wind. If the temperature is high during the day and low at night, the temperature in the field can be adjusted by daily irrigation and night irrigation.

Apply strong tail fertilizer before the wind. 2-3 days before the cold dew wind comes, topdressing urea 2.5-3 kg and potassium sulfate 4-5 kg per mu, or compound fertilizer 3-4 kg, in order to improve the cold resistance and wind resistance at the heading stage of late rice and reduce the neck wrapping and premature aging of late rice ears.

Artificial water spraying during the period of spraying dry cold air and growth hormone can improve the field humidity, moderate the cooling range and weaken the transpiration of rice leaves. At the heading stage of rice, if it is predicted that the low-temperature wind damage is about to invade, the "920" 1 ~ 1.5g should be dissolved in a small amount of liquor in advance, and potassium dihydrogen phosphate 3+ 1 package of nutritional nucleotides should be added and sprayed with 60kg of water.

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