Meteorological disasters endangering crops in autumn and winter

Frost is the meteorological disaster that harms crops in autumn and winter.

Frost is a common agrometeorological disaster, which means that the temperature drops suddenly and the surface temperature drops below 0℃, causing damage to crops and even death. Frost usually appears in autumn, winter and spring. It is different from frost. "Frost" is a white ice crystal that condenses directly on objects when the water vapor in the air near the ground reaches saturation and the ground temperature is lower than 0℃. When there is frost, it is not necessarily frost. There may not be frost in first frost, and there may not be frost in first frost.

The solar terms "first frost", "first frost" and "First Frost" are not the same thing, but three different concepts. "Frost" refers to a white ice crystal formed by condensation of water vapor on the ground in cold weather; "Frost" refers to a common agricultural meteorological disaster phenomenon; The "first frost" solar term refers to the season that reflects the sudden drop of temperature.

Anti-freezing method

1, smoking method

The smoking method is to use firewood, cow dung, sawn wood, waste engine oil, red phosphorus or other dust and smoke substances that can produce a lot of smoke, and light it half an hour before the frost comes or 1 hour. These smog can block the loss of heat on the ground, and the smog itself will also generate some heat, which can generally raise the air temperature near the ground by 1-2℃. However, this method has certain weather conditions, high cost and air pollution, and is not suitable for universal promotion. Only suitable for short-term frost protection of rare trees and their nurseries.

5, frost fertilization method

Applying organic fertilizer early before cold wave, especially using semi-decomposed organic fertilizer as base fertilizer, can improve soil structure and enhance its heat absorption and insulation performance. You can also use the semi-decomposed organic fertilizer to emit heat in the process of continuing to decompose, thus increasing the soil temperature. After winter, warm fertilizer can be used to cultivate forest plants, and the antifreeze effect is obvious.

Warm fertilizers are commonly used, such as manure, compost and plant ash. This method is simple and feasible, but it should be applied 3-5 days before the frost comes to master the local climate law. After winter, lime water can be used to whitewash the trunks of trees and fruit trees to reduce heat dissipation.

The above contents refer to Baidu Encyclopedia-Frost (an agricultural meteorological disaster phenomenon).