Detailed explanation of the key points of anti-freezing technology of fruit trees

Fruit trees are prone to frost damage in winter, so it is very important to prevent freezing for fruit trees. Here is a detailed explanation of the key points of anti-freezing technology for fruit trees for your reference.

First, the tree pole is painted white.

Brushing the tree stem can protect the tree stem and reduce the freezing injury. The preparation of whitening agent can be prepared with quicklime 30 kg, sulfur powder 2-3 kg, agricultural salt and flour 0.5 kg each, a small amount of vegetable oil and 100 kg water. Or directly use Warling Shield whitening agent for protection.

Second, cultivate the soil and bandage

Cultivate soil around the tree pole about 40 centimeters high, in the shape of steamed bread. The soil should be taken far away, and it is best to combine with organic fertilizer such as Shi Tang mud and tidal mud to cultivate the soil. If the soil is taken from the tree plate, it will often cause the main rod to keep warm, but the root system in the tree plate is exposed or the fine root is shallow and close to the topsoil and often aggravates the freezing injury. It is generally appropriate to cultivate the soil before and after the heavy snow, and it is appropriate to pick the soil before and after the sting.

Third, fruit tree cover

Cover the crown directly with grass curtain or film to improve the anti-freezing and anti-damage ability of fruit trees. The method of full coverage was used to increase the ground temperature and improve the survival rate of fruit tree seedlings.

Fourth, apply fertilizer to prevent cold

Dry weather often aggravates frost damage, and all localities can irrigate "winter water" according to local conditions to reduce frost injury, restore tree potential and enhance damage resistance, and apply winter fertilizer combined with irrigation, which is dominated by organic fertilizer and increase the proportion of phosphorus and potassium.

The amount of fertilizer should be supplemented according to the amount of fruit. For heavy frozen trees, the fertilization period can be postponed appropriately.

In addition, all localities should earnestly do a good job in clearing the garden in winter, prevent the harm of diseases and insect pests, and protect healthy leaves that are not frozen through the winter. After the beginning of spring, apply topdressing to fruit trees in time, mainly nitrogen fertilizer, more human feces and urine, apply frequently and thinly, add new branches and leaves, promote the growth of fruit trees and restore the tree potential.

Heating and fumigation

Use local materials to collect weeds, husks, sawdust, fallen leaves, etc., 4-6 piles per mu, covered with wet grass or thin mud, lit before a windless sunny night to produce smoke, restrain radiation countercurrent and prevent frost. However, this measure must ensure fire safety.

VI. Anti-freezing of biogas slurry

The experimental results show that the application of biogas slurry can enhance the tree potential and prevent frost injury. The method is as follows: filter the biogas liquid with gauze, the concentration is the original solution, if the concentration is too high, it can be diluted with water properly, spray with sprayer, spray all branches and leaves evenly. It is required to spray every 10-15 days after fruit picking, three times in a row.

7. Clear the snow

Gently tap the branches of the fruit trees to make the snow attached to the fruit trees fall to the ground and reduce the freezing damage of the snow to the leaves and branches.

8. Cut green after freezing

The orange trees that have been frozen should be cut off in time, that is, the heavily frozen autumn shoots and late autumn shoots should be cut off, and the cut should be kept blue two centimeters below the frozen branches. For the lighter frozen branches, if the leaves have dried up, remove the dead leaves in time to avoid water loss and prevent frost damage from aggravating, so as to restore the tree potential as soon as possible.

9. Thinning flowers and fruits

For the fruit trees with serious freezing injury, all the buds should be removed in the early flowering stage in spring to ensure the exuberant tree potential; the less frozen fruit trees should pay attention to the thinning of flowers and fruits, and at the same time, increase the application of fruit fertilizer to improve the production efficiency of the orchard.