According to CCTV, it is expected that there will be frost in eastern Inner Mongolia and western and northern Heilongjiang from September 15 to 16. From the 17th to the 18th, there will be frost in the central and eastern Inner Mongolia, western and northern Heilongjiang, and western Jilin.
Since September, most of the northeastern region has sufficient sunshine and suitable soil moisture, which is conducive to the late filling and maturity of crops such as rice, spring corn and soybean. It is expected that soybeans in Heilongjiang will be mature at the end of mid-September; spring maize and one-season rice in northwestern Jilin and Jilin are in the mature to mature stage, and frost has little effect on crop maturity. There is no frost in Xinjiang's agricultural areas, which is conducive to the full filling of mature crops such as corn and cotton cracking bolls. In the northeastern region, it is necessary to do a good job of frost prevention; in areas with late developmental stages, it is necessary to take appropriate measures to promote precocity, pay attention to prevent the adverse effects of frost;
Frost appears in autumn, winter and spring. It means that the temperature of the air suddenly drops, and the surface temperature drops to below 0 °C, causing damage to crops and even death. It is different from frost, and it is not necessarily frost when it is frosted. The frost that appears for the first time each fall is called the first frost. The last frost in the spring of the next year is called the final frost. The effect of the first frost on the crops is greater.
The main hazard of frost on crops is that the inside of the crop is composed of many cells. After the frost freezes, the temperature suddenly rises, and the water that the crop seeps out quickly turns into water vapor, and the water lost by the cells. When the law is restored, the crop will die.
Frost post-disaster recovery
field
Actively strengthen field management: vegetables, seedlings that have been frozen and damaged, should be cleared of frozen debris on sunny days, pay attention to the occurrence and prevention of gray mold and early blight of solanaceous vegetables. It can be sprayed with 50% chlorhexidine 1000 times, 15% green Jiabao 1000 times, and 28% gray mold gram 500-1000 times. At the same time, combined with the prevention and treatment of viral diseases and aphids, viral diseases can be used to suppress stars, bacteria and kill stars, etc., aphids can be controlled with imidacloprid. For seedlings that have not been frozen, they should also catch the sunny day and apply them once in the above way. Continuous rainy weather, can not apply, can use 20% hundred rot fumigant, according to the greenhouse space 0.2-0.3 g / cubic meter for the amount of smoke, pay attention to weak seedlings and can not be used in the shed.
orchard
The orchard can take the following measures: 1. After the flowering period is frozen, the gibberellin can promote the parthenocarpy and make up for a certain yield loss if the receptacle is not damaged. 2. Implement artificially assisted pollination to promote fruit setting; spray 0.3% borax + 1% sucrose solution to improve the fruit setting rate. 3. Strengthen the comprehensive management of soil, fertilizer and water, root the trees, promote fruit development, increase the weight of single fruit, and restore the yield. 4. Strengthen the comprehensive prevention and control of pests and diseases: After the fruit trees are damaged by the night frost, the tree body is weak, the resistance is poor, and pests and diseases are prone to occur. Therefore, we must pay attention to strengthen the comprehensive prevention and control of pests and diseases, in order to minimize the production and economic losses caused by pests and diseases.
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