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Late rice is most afraid of Cold Dew wind. Methods of preventing and controlling cold dew wind in Rice

DailyBird Culture 2021-10-09 1 0

on October 8, 2017, people will usher in the annual cold dew solar term. Before and after the cold dew solar term, farmers planting late rice in South China are nervous, in order to prevent a common meteorological disaster - "cold dew wind" from causing losses to late rice in South China. So today's old yellow calendar will introduce you the methods of rice to prevent cold dew wind.

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, 寒露风的防治,

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late rice is most afraid of "cold dew wind",

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cold dew wind, which is a low-temperature chilling injury that causes significant local cooling after the invasion of cold air in autumn. Cold dew wind is the most common major meteorological disaster affecting the production of late rice in southern China. As long as the Cold Dew wind blows, the flowering, pollination, fertilization and grain filling of late rice will be affected, the dry grains of rice ears will increase and the seed setting rate will decrease significantly; Cold dew and strong wind will even cause the "green withering" death of late rice. Along the Yangtze River Valley in China, there is an agricultural proverb "cut and feed the old cattle before the autumn equinox". The Cold Dew wind of

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is mainly caused by the cold air from the North moving south. When autumn comes, the frequency and intensity of cold air activities increase, and the temperature decreases to form cold dew wind. Cold dew wind can be divided into two situations: first, the cold air is very strong, which drives straight from the north. It is characterized by relatively dry and cold, obvious cooling, dry air, strong wind, and large temperature difference between day and night; Second, when the cold air from the north goes south, it encounters a gradually weakening warm and humid air flow in the south. As soon as the cold and warm air collides with each other, coupled with enough water vapor, low-temperature, cloudy and rainy weather will appear. These two kinds of weather are the great enemies of late rice. Prevention of

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cold dew wind

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shall be irrigated immediately before the Cold Dew wind, so as to avoid heat loss in the paddy field and slow down the cooling process. Generally, the water shall be 7 ~ 10cm deep, and the water shall be drained gradually after the Cold Dew wind. If the temperature is high during the day and low at night, the method of daily drainage and night irrigation is used to adjust the field temperature. Strong tail fertilizer should be applied before

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. 2-3 days before the Cold Dew wind, for the seedlings with weak growth and light leaf color, 2.5-3kg urea plus 4-5kg potassium sulfate or 3-4kg compound fertilizer should be applied per mu to improve the cold and wind resistance of late rice during heading and reduce the neck wrapping and premature senescence of late rice ears.

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water spraying and spraying growth hormone can increase the field humidity, ease the cooling range and weaken the leaf transpiration of rice plants. During the heading period, if the low temperature wind damage is about to invade, the 1 mu to 1.5 grams of "92" can be dissolved in a small amount of Baijiu in advance. The addition of potassium dihydrogen phosphate 3 two and nutrient nucleotides 1 packets will be applied to 60 kg of water.

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