How to reduce the degree of freezing injury of citrus if the freezing injury is light or the yield is reduced and the tree dies?

Citrus frost injury, light deciduous, yield reduction the following year, heavy branches are broken, the whole plant died. In order to prevent sudden low temperature and cold wave and reduce the degree of citrus freezing injury as far as possible, the following measures can be taken to prevent citrus frost in winter.

Citrus

1. Timely application of base fertilizer: the application of base fertilizer for local citrus should be completed between late October and mid-November. Too early will promote sprouting in late autumn, and too late due to low ground temperature will hinder root wound healing.

two。 Irrigation in the garden: in December, the citrus in the garden begins to be irrigated, and the soil should be kept moist when there is no rain in winter. Fill up with enough water 3-5 days before the cold wave.

3. The white soil of the main pole: the main pole is coated with 30-40% lime liquid, the soil is cultivated at the interface between the ground plant and the rootstock, and the soil pile is higher than 30cm. Bai Pei soil can reduce the harm of melting snow and temperature and the occurrence of peeling disease after freezing.

4. Spray steam inhibition heat preservation agent: spray the whole tree crown with 200 times steam inhibition heat preservation agent 5-7 days before the cold air. Spray again immediately after the cold wave.

5. Canopy cover: when the lowest temperature drops below 0 ℃, cover the canopy with non-woven cloth and plastic film. When it clears up after the cold wave, and when the temperature is above 5 ℃ during the day, you can remove the mulch and cover it with frost prevention at night. If the conditions permit, a simple plastic shed can be built to keep warm before the end of November.

6. Remove the snow from the canopy: when you encounter heavy snow, shake the branches of the crown in time to shake off the snow and prevent the snow from breaking the branches.

7. Sprinkle quicklime on the ground: when it is clear at night after snow, 50-100kg granular quicklime is scattered in the orange orchard. Quicklime can increase the temperature in the garden and reduce the harm of radiation cooling by decomposing the gas.

8. Foliar fertilizer spray: after the cold wave, spray clear water at noon (10:00-3pm) every 1-2 days, 5-6 times in a row. About 7 days after spraying 0.3% urea and 0.2% potassium dihydrogen phosphate solution, 3-4 times in a row. Reduce citrus dehydration and defoliation after freezing and restore tree potential by foliar fertilization.