Anti-freezing technology of growing citrus

For the fruit trees seriously affected by freezing, measures should be taken to protect the fruit trees: first, cultivate the soil to increase the temperature. Cultivate the soil to protect the root neck, the standard of soil cultivation is that the root system is not exposed and cover the root neck; second, the branches are painted white and bandaged. The trunk and main branch are the skeleton of the tree, which is easy to be damaged by freezing, which leads to the weakening of the tree potential, the cracking of the cortex and the death of the whole plant. The whitening agent is usually prepared with 10 jin of lime, 1 jin of sulfur powder, 0.2 jin of salt, a little edible oil and 30 jin of water. The main trunk is bandaged with straw or coated with mud, the anti-freezing effect is better, when bandaging, pay attention to the grass head to press the grass tail and tie tightly, so as not to freeze the stagnant water in the grass; the third is smoke. It is mainly to prevent the thick frost after freezing, which can reduce the radiation heat and reduce the frost. Smoking materials can be used locally, such as weeds, branches and leaves, 4-6 piles per mu. Frost generally appears in the early morning, should be mastered in the critical temperature of frost injury before the ignition smoke; fourth, spray steam insulation agent. Heat preservation agent can form a layer of molecular film on the leaf surface, inhibit water evaporation, reduce leaf cell water loss, and have the effect of anti-freezing; fifth, strengthen ploughing and loosening soil, increase fertilizer application, prevent waterlogging, drought and pest control, and restore tree potential as soon as possible. pay attention to the prevention and control of gum disease after freezing.

For fruit trees less affected by freezing, it is also required to do a good job in pest control and water and fertilizer management. If slightly frozen, curly leaves or yellow leaves occur, and the growth situation is weak, 0.2% urea + 0.2% potassium fertilizer or 0.2% potassium dihydrogen phosphate can be applied to the leaves for 2 or 3 times immediately. After early spring, spring fertilizer is applied early. According to the principle of "minor injury to pick leaves, medium injury to pruning, big injury to saw dry" principle.