Autumn cream, also known as early frost, first frost. Frost is one of natural disasters and it causes varying degrees of damage every year.
In general, the northern part of the country will see frost in late September, and the upper part of the dam will see frost in early September (the end of August in individual years). The middle part sees frost in early October, and the southern part is a little bit more 1-2 days later than the middle part. For large areas of frost protection, there are still some difficulties, and measures such as selecting and breeding good breeds, adapting measures to local conditions, and rational distribution should be adopted. Here are some common and effective methods for reference.
1. Covering anti-frost: When forecasting frost at night, cover plants. When using thin films, it is best to be opaque and reflective. Or use the leftovers of the slaughtered animals to make foaming agents sprayed on the plants to form foam, cover the plants, and provide insulation.
2, water spray anti-frost: the heat capacity of water is very large, than the plant body temperature of water falls on the plants, can make the body temperature rise, the water released when the latent heat. Note that it is best not to stop spraying, stop when the sun comes out, prevent ice formation, and increase freezing damage.
3, heating anti-frost: burn a variety of combustibles to heat the air and plants, in the radiation frost and flow type frost occurs, there is an inversion layer near the ground, even and slow heating, the lower air can increase plant temperature, prevent Frost damage occurs.
4, smoke anti-frost: slowly burning smoke, ignition in the upper side, the release of heat to heat the air, smoke contains a large number of hygroscopic particles, water vapor condensation heat release.
5, disturbance anti-frost: is to make the static air flow up and down together. Everyone knows that there is generally no frost in nights with strong winds. This is the reason. According to reports, the use of helicopters abroad, ultra-low air to do "8" type flight several times, will be able to solve the problem of frost. Of course, we do not have such conditions at the moment, but with the rapid economic development, we may as well try.
In general, the northern part of the country will see frost in late September, and the upper part of the dam will see frost in early September (the end of August in individual years). The middle part sees frost in early October, and the southern part is a little bit more 1-2 days later than the middle part. For large areas of frost protection, there are still some difficulties, and measures such as selecting and breeding good breeds, adapting measures to local conditions, and rational distribution should be adopted. Here are some common and effective methods for reference.
1. Covering anti-frost: When forecasting frost at night, cover plants. When using thin films, it is best to be opaque and reflective. Or use the leftovers of the slaughtered animals to make foaming agents sprayed on the plants to form foam, cover the plants, and provide insulation.
2, water spray anti-frost: the heat capacity of water is very large, than the plant body temperature of water falls on the plants, can make the body temperature rise, the water released when the latent heat. Note that it is best not to stop spraying, stop when the sun comes out, prevent ice formation, and increase freezing damage.
3, heating anti-frost: burn a variety of combustibles to heat the air and plants, in the radiation frost and flow type frost occurs, there is an inversion layer near the ground, even and slow heating, the lower air can increase plant temperature, prevent Frost damage occurs.
4, smoke anti-frost: slowly burning smoke, ignition in the upper side, the release of heat to heat the air, smoke contains a large number of hygroscopic particles, water vapor condensation heat release.
5, disturbance anti-frost: is to make the static air flow up and down together. Everyone knows that there is generally no frost in nights with strong winds. This is the reason. According to reports, the use of helicopters abroad, ultra-low air to do "8" type flight several times, will be able to solve the problem of frost. Of course, we do not have such conditions at the moment, but with the rapid economic development, we may as well try.
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