First, the physical method of defense 1. Orchard irrigation poured in the fruit before budding 2 to 3 times, flowering can be postponed for 2 to 3 days; after germination watering, flowering can be postponed for 3 to 5 days. Spraying water to the fruit trees by spraying two minutes or two minutes before the low temperature frost can delay the flowering period by more than 10 days. 2. Smoke smoke falls to 0Â°C at night, and igniting smoke in an orchard can increase the temperature of the environment and effectively reduce its freezing damage. Each orchard orchard should discharge 4 to 6 cigarettes. 3. Trunk Whitening Spring White coated branches are used to whiten the fruit trees, which can effectively reduce the absorption of solar heat and delay fruit sprouting and flowering for 3 to 5 days.
Second, the chemical defense In the budding of fruit trees 2 to 3 days before flowering, spraying the plant cold-resistant agent to the tree can prevent freezing damage and can increase production by more than 20%. Spraying aqueous solution of indole acetic acid can inhibit flower buds germination and improve their cold resistance. For flowering fruit trees, phosphorus and potash fertilizers, or 0.3% to 0.6% potassium dihydrogen phosphate solution may be sprayed on the fruit trees before the occurrence of low-temperature frost damage to enhance the cold resistance of the fruit trees and reduce their frost damage.
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