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Affected by strong cold air, there were large-scale frosts in Anhui Province on the morning of the 16th and 17th, and on the 17th, 32 cities and counties in the province had frost. It is expected that there will be a precipitation process in the province from 19 to 21 days. At the same time, affected by cold air, from 20 to 21, the northerly winds of the province will increase to about 4, and the gusts will be 7 and the average temperature will continue to drop by 5-7 °C. The lowest temperature on the morning of the 22nd: Huaibei, northern Jianghuai, the mountainous area of ​​the province 0~2 °C, frost or frost may occur; other areas 2 ~ 4 °C. The weather in the province turned better from 22 to 24 days.
The specific forecast is as follows: 18th: Huaibei is cloudy to cloudy; the Huaihe River is cloudy to the south. Among them, there is light rain in the south of Jianghuai and most of the south of the Yangtze River. 19th: There is light rain on cloudy days in the province, including rain in parts of the north of the river. 20th: There is light rain on cloudy days in the province. Among them, there are moderate rains and partial heavy rains along the south of the Huaihe River. 21st: Huaibei is cloudy with cloudy days; there is light rain on the south of the Huaihe River, with rain in parts of the south of the Yangtze River. 22nd: Jiangbei cloudy days turn cloudy; Jiangnan cloudy days. 23 to 24: The province is cloudy to sunny.
Agro-encyclopedia knowledge: Frost
Method of preventing frost:
Irrigation method: irrigation can increase the air humidity near the ground, protect the ground heat, and increase the air temperature (which can raise the air temperature by about 2 °C). Due to the large heat capacity of the water and the slow cooling, the field temperature does not drop quickly. As for small-area garden plants, water spray can also be used. The method is to spray water on the plants 1 hour before the frost comes. Because the water temperature is higher than the temperature, the water will release heat when the plant is cold, and the water temperature is higher than the freezing point, so as to prevent frost, the effect is better.
Covering method: Covering plants with straw, wheat straw, grass ash, weeds, nylon, etc., can prevent the attack of cold air outside, and reduce the heat loss of the ground, generally raising the temperature 1-2 °C. Some dwarf seedlings and plants can also be buried by the soil so that the frost will not be frozen. This method can only prevent small areas of frost, which has the advantage of long antifreeze time.
Smoked smoke method: It is fired with half a hour or one hour before the frost comes with firewood, cow dung, sawn wood, waste engine oil, red phosphorus or other dusty substances that can generate a lot of smoke. These smog can block the loss of heat on the ground, and the smoke itself will generate a certain amount of heat, which generally increases the temperature of the air near the ground by 1-2 °C. However, this method must have certain weather conditions, high cost, pollute the atmosphere, and is not suitable for general promotion. It is only suitable for the prevention of short-term frost and use on precious forest trees and their nurseries.
Fertilization method: Apply organic fertilizer early before the cold wave, especially the semi-fertilized organic fertilizer as the base fertilizer, which can improve the soil structure and enhance its heat absorption and warmth retention performance. It is also possible to use semi-humic organic fertilizer to emit heat during the process of continuing to ripen and increase the soil temperature. After winter, warm fertilizer can be used to cultivate forest plants, which have obvious antifreeze effect. Commonly used for warm fertilizers are manure, compost and grass ash. This method is simple and easy, but to master the local climate law, it should be applied 3-4 days before the frost. After winter, the trunks of trees and fruit trees can be whitened with lime water to reduce heat dissipation.
After frost weather management agricultural facilities
1. After the frost is low and the cloudy sky suddenly turns clear, the plastic arch shed should be cooled in time to prevent high temperature plants from snoring.
2. After the cloudy day suddenly turns clear, the solar greenhouse adopts a method of placing half a sputum and releasing flowers to avoid the sudden rise of temperature to cause the plants to snoring, and then all the plants are re-opened after the plants resume growth.
3. Spray water or 0.2% aqueous urea solution or 0.2% potassium dihydrogen phosphate solution in time to increase the resistance of the plants.
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