Because of its unique geographical environment, the alpine tea garden has a superior quality of tea in many producing areas than many ordinary tea gardens. However, the management of alpine tea gardens is also more difficult, especially in the winter and spring seasons. The following are experts who have explored the anti-freeze technology of tea trees in the alpine tea area for many years, and summarized a set of comprehensive measures to prevent and cure freezing damage. Now introduce its key technologies as follows: First, choose the varieties of cold-resistant tea trees to lay the foundation for the cold resistance of tea gardens China's tea producing areas are vast, and the large-leaf tea trees cultivated in the southern tea area have very weak cold resistance, while the middle and small leaf tea trees cultivated in the northern tea area have strong cold resistance, even in the same area of ​​tea trees, the cold resistance between the varieties. The abilities vary widely. Therefore, in the development and construction of alpine tea gardens, it is first necessary to select the varieties with strong cold resistance among the fine tea varieties recommended by the state, or to select the varieties with high yield and high quality that have been successfully planted in the local alpine tea area, which is to solve the problem of tea tree suffering. The fundamental measure of freezing damage. At the same time, it is necessary to build a garden with high standards. Before planting the tea plant, the tea garden should be fully reclaimed and re-applied, then leveled and smashed, planting the planting ditch according to the planting standard, and planting the base fertilizer in the planting ditch. Generally, 2000-3000 kg of organic fertilizer per mu, 60-200 kg of dried cake, and 100-200 kg of compound fertilizer are used to lay a good foundation for cold and anti-freezing of tea trees. Second, optimize cultivation management measures to cultivate strong tea tree growth By strengthening cultivation management and promoting the robust growth of tea trees, it can effectively improve the cold resistance of tea trees. Specific measures: First, deep tillage and fertilization, every year after the end of autumn tea picking, the tea garden will be deeply cultivated and soil will be promoted to promote the deep growth of tea roots to the soil. At the same time, combined with deep tillage and heavy application of base fertilizer, 1000-1500 kg of decomposed pigs can be applied per mu. Farm manure such as bar dung, or 100-150 kg per mu of applied cake, or 100-150 kg per mu. Fertilization should be applied early, no later than the end of October, and must not be fertilized after the winter cold wave. Deep tillage and fertilization can not only improve soil fertility, but also improve soil physical and chemical properties, increase soil temperature, promote the growth of tea tree roots, and improve the cold resistance of tea trees. The second is reasonable picking and timely closure of the park. Adhere to the spring tea leaves, the summer tea begins to leave the fish leaves, leaving a leaf in the late stage, the autumn tea leaves 1 to 2 leaves to pick, and stops picking when the temperature is still mild, so that the tea tree keeps the rich green leaf layer overwintering. Third, use physical methods to protect tea trees and reduce frost damage Covering the tea plantation can effectively alleviate the damage caused by freezing to tea trees. One is to lay grass between the rows of tea trees. Paving grass can increase the soil temperature above 2 °C, and the temperature difference can be reduced by more than 3 °C, which can significantly reduce the frozen soil layer of the tea garden and protect the roots of the tea tree from dying due to freezing damage. Therefore, the alpine tea garden must adhere to the grass-spreading measures before entering the winter. Straw, weed, wheat straw and other various crop straws can be used as the grass material. The thickness of the grass is about 12 cm, and it should be evenly covered and there is no subsoil. The second is the cover of the tea tree. Before the advent of the cold wave, the straw can be covered with straw, film, etc., and it can also effectively resist the cold wave attack, but the cover should be opened in time after the cold wave. Fourth, use the fumigation method to prevent night frost, prevent the surface and tea tree surface from dissipating a lot of heat During the occurrence of frost, firewood can be set up in the tea garden by firewood, glutinous rice, etc. according to the wind direction, topography and area. When the cold wave is coming and the temperature drops to about 2 °C, the firewood will be ignited, so that firewood, glutinous rice, etc. can form smoke, which can reduce the sinking of cold air, increase the ground temperature and reduce the frost damage. V. Rescue measures for suffering from freezing tea trees The tea trees subjected to freezing damage are light and dark, the branches are withered, and the growth of the shoots is blocked; the leaves are detached, the branches are dead, and the life is lost. Therefore, according to the freezing situation of tea trees, corresponding rescue measures should be taken. 1. Pruning in time. After the tea tree is frozen, the leaves and leaves that have lost their vitality must be cut off in time to regenerate the new shoots, cultivate the skeleton and pick the noodles. The degree of pruning should be tailored to the local conditions and should be tailored to the tree. For general freezing of tea trees, light pruning or deep pruning may be adopted to cut off the branches and leaves of the canopy. If the damage is serious and the backbone branches have been damaged, heavy pruning should be taken; if the damage is extremely serious, the entire upper and lower leaves have been lost. If you are energetic, you must take Taiwanese. The pruning should be carried out immediately after the temperature rises steadily in the early spring. It should be sooner rather than later, but it should be prevented from attacking the cold. 2. Cultivate loose soil. Grasp the soil and start thawing, carry out cultivating loose soil, improve soil permeability as soon as possible, increase soil temperature, and promote the recovery of tea trees. 3. Add fertilizer. Combined with cultivating loose soil, timely application of fertilizer, on the basis of the application of organic fertilizer, combined with the application of quick-acting nitrogen fertilizer and compound fertilizer. 4. Focus on crown culture. For the lightly pruned frozen tea trees, the picking method should pay attention to keeping the leaves and raising the tips, picking them in batches, and picking one large leaf for spring tea picking, and picking summer and autumn tea as usual. Tea trees that have been heavily trimmed or sturdy should be cultivated and re-cultured. The above are all the main points of the prevention and control of alpine tea garden freezing damage. The tea farmers who want to learn can collect. 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