Main trunk whitening: The trunk whitening in early spring can make the tree temperature rise and fall slowly, reduce sun burning and freezing injury, delay fruit sprouting and flowering, thus effectively avoiding early spring frost damage, and simultaneously treat trunk diseases and pests. Smoke protection and frost protection: According to the experiences of frost-bearing fruit trees in the past years, attention should be paid to the weather forecast after the fruit trees are sprouted. Especially at night, when the temperature drops to the freezing temperature of the fruit trees, smoking is started until the temperature rises to the freezing critical temperature. Turn off when above. Generally, the firewood with large smoke and a bit of moisture is used as a raw material, such as wheat straw, fallen leaves, sawdust, etc., or smoke is smoked with a frost-resistant aerosol agent. In order to improve the effect of preventing frost, the principle of putting more firewood on the windward and lowering the firewood on the downwind can be applied. Generally, the piles of 5 to 5 pounds per mu of orchard are piled, and each pile of material is about 25 kilograms. Before the frost irrigation: 3 days to 5 days prior to the low temperature, watering in time, the best control effect. Before the frost irrigation, the water temperature is higher than the soil temperature at night, the water can increase the soil a lot of heat, while irrigation can make the soil thermal conductivity increased, is conducive to the deep heat transfer of the soil upward, do not scratch after the irrigation. Spraying anti-frozen agent: freezing in the fruit tree before germination until flowering, spraying can improve the resistance of the fruit of the agent, while spraying with foliar spray, can effectively prevent the occurrence of frostbite. Judging from the test investigations, both Lifan, Baode, Zhiyingling 83, and PBD can all achieve good results.
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