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Citrus trees after freezing care measures (1)
After the citrus trees were frozen, the above-ground parts suffered various degrees of damage or withered, while the underground parts were generally less damaged. The post-freezing nursing measures are mainly to use its relatively intact root system, promote its germination, to restore the canopy as soon as possible, and gradually achieve the purpose of normal growth results. Specific measures include the following aspects. 1. Treatment of frozen crowns. According to the severity of frostbite, the principles of timely removal of frozen parts and retention of healthy parts should be adopted as much as possible. The canopy should be properly and timely treated: (1) If it is slightly frozen and curling occurs, some leaves should be cut off in time and 0.3% sprayed. About 2-3 times of urea solution to prevent the expansion of fallen leaves. (2) The leaves are frozen and wilted but do not fall off, but the shoots are not dead. Since the dead leaves continue to consume water, they will expand and suffer freezing, and should be promptly knocked down, removed or cut off withered leaves to prevent shoot tipping. (3) Some of the branches have been frozen, it is advisable to cut off immediately some of the frozen branches that can be identified by the naked eye. When the new shoots germinate, when the boundary between life and death is clear, the frozen parts should be completely cut off. (4) Severely frozen trees, the entire canopy has been frozen to death, should be sawed first, leaving the main stem and the main branch base not processed, until the first new shoots on the pumping old mature, and then sawing To the lower part of the junction between the cold damage department and the health department. After such a tree is cut off, it is the primary task to raise the roots to “protect lifeâ€. When a large number of new shoots are sprouted, in addition to removing the delicate shoots at the dense sites, as much as possible should be left to accumulate photosynthetic nutrients to nourish the root system. And select from them to stay 2-3 growth and robust, appropriate picking heart, promote its branching, cultivate a new crown structure. (5) Branches damaged by snow damage should be saved as much as possible. For large torn branches, some branches and leaves should be cut off to reduce water consumption. Then they should be aligned in situ, wrapped with plastic film, and tied with ropes. Bound, set up a bracket to be fixed and then loosened later. If it is irrecoverable, it should be removed soon. After the saw is dry, the wound surface is larger. Use a sharp knife to flatten it. Brush the protective agent to prevent mildew and promote healing. The protective agent can be added with yellow mud plus fresh cow dung plus 2,4-D 100 mg/kg; also Vaseline (or water tar) 250 g plus carbendazim 5 g. According to a recent report, the "Sanling Cream" formulated with 1 gram of "900", 50 grams of carbendazim, and 10 kilos of Vaseline is also effective in protecting wounds.