How to prevent freezing damage to kiwi trees

Winter is an important period for kiwifruit to restore its vigor and replenish vitality. It is necessary to strengthen the winter management of kiwifruit trees to ensure that kiwifruit can survive the winter safely and lay a good foundation for a bumper harvest in the coming year.

Causes of freezing damage

There are two main periods of freezing damage to kiwifruit: one is winter freezing damage. Kiwifruit generally does not cause freezing damage when the temperature in winter slowly drops. If the temperature is high in the previous period, if the temperature suddenly drops to -10℃, freezing damage will occur; The other is the damage of early spring and evening frost, which causes the newly grown shoots to wilt and die, resulting in a significant reduction in output.

The law of freezing damage

In terms of topography, plains generally suffer more damage than hilly areas, while deep mountains, mountain sides, and wind vents suffer the least damage, with almost no frost damage. In terms of soil type, sandy land suffers more damage than clay soil; in terms of tree age, Large trees suffer less damage, while 1-3 year-old young trees suffer more; from the perspective of tree growth, vigorous and strong trees suffer less, and weak trees suffer more; from the perspective of the results, those with more results suffer more, and those with less results suffer less.

Prevention of freezing damage

The combination of soil cultivation and cold protection, deep plowing, fertilization, and cultivation of soil about 50 cm above the ground can make the tree strong and prevent frost damage.

Protection of branches and trunks In late autumn, whiten the trunks and large branches, or wrap the branches with straw, wheat straw, etc., and wrap them with plastic film. Whitening agent formula: 0.5-1 kg quicklime, 0.15-0.25 kg sulfur powder, 0.15-0.25 kg soybean powder, 0.2 kg salt, 5-7.5 kg water. Promote and control growth, strengthen fertilizer and water management in the early stage, apply more nitrogen fertilizer to promote growth, and do not apply nitrogen fertilizer after late July, but increase phosphorus and potassium fertilizers to make the tree full and enhance resistance.

Spraying of trace elements Spray calcium nitrate solution or trace element solution during the fruit expansion period, spray once every 2 weeks, and spray 3-4 times.

Spray rare earth micro-fertilizer during the fruit swelling period in June, spray rare earth micro-fertilizer 200 times liquid or Guoyou brand amino acid, spray once every 2 weeks, spray 3 times.

Before freezing damage occurs by spraying antifreeze, spray chelating salt preparations, emulsifiable paste preparations and other antifreezing agents on the whole tree, which can effectively reduce low temperature damage.

Spraying water on trees According to the weather forecast, spray water on the tree body when low temperature occurs. The heat released when the water condenses can alleviate the rapid changes in temperature and reduce the hazards of frost.

The heat and smoke released by the orchard smoke can relieve the sharp local cooling and play an antifreeze effect.

Coating the trunk with amino acids Coating the trunk with Guoyou brand amino acids can effectively enhance the resistance of the tree.

Remedial measures after freezing

Increase the application of fertilizer and water to promote growth, so that the new shoots can stand in the morning and restore the tree vigor as soon as possible; after the new shoots are issued, cut off the frozen parts, leaving a branch that can form the crown of the year, and cut off the remaining branches in time ; With severe freezing damage, new varieties can be grafted and management should be strengthened to promote healthy growth.

Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone