In the early spring, the weather is abnormal and the temperature is warm and cold. This climatic condition is extremely unfavorable to tea gardens producing high-quality premium tea. With the increase of early mature seeds, the improvement of the level of fertilizers, and the application of advanced science and technology, tea germination is becoming more and more early. In the past decade or so, the loss of tea gardens caused by the impact of early spring weather has occurred everywhere. In particular, the introduction and promotion of early-cultivation tea areas has occurred frequently and caused more losses. Therefore, we must actively take preventive remedial measures. 1. Prevention measures for frost damage in early spring According to local climatic conditions, choose suitable sites to open up tea gardens, and avoid establishing tea gardens in low-lying lands, wind vents, and high altitude mountains. The tea gardens are best set up on the slopes of the mountains facing south and sunny. When constructing a garden, it is advisable to create shelterbelts on the north side of the tea garden so as to reduce the wind speed, block cold currents from attacking, and expand the leeward surface so as to improve the microclimate of the tea garden. The tea farms should pay attention to local weather forecast at any time in the early spring and take measures to prevent late spring in advance. After the release of the cold wave forecast, for early-cultivated tea gardens that have sprouted leaves, it is necessary to focus on ploughing young shoots to reduce the damage caused by freezing. The use of straw, weeds, or shading nets to cover the tea in the windward slope tea gardens that are prone to frost damage can not only reduce the cooling rate, but also reduce the excessive water transpiration of the leaves, and promptly lift the cover after the cold tide. When the area of ​​the tea garden is relatively large, the method of fumigation can be used to prevent cold damage to the early spring tea trees. That is, when the cold wave approaches and the temperature drops to about 2°C, hay, sorghum, etc. are ignited in the tea garden to create smoke, which prevents heat from spreading. It will warm the tea garden. When the temperature approaches 0°C, watering the canopy can prevent light freezing. When the cold wave arrives, watering the tea garden can reduce the soil temperature in the tea garden, increase the humidity in the tea garden, and make the cold air less susceptible to intrusion. At the same time, the humid tea garden soil has large heat capacity, increased thermal conductivity, slows down during the day, and cools down at night. Therefore, cold waves occur. In the first few days, the tea tree is not susceptible to freezing. When the tea garden with sufficient water supply and good conditions encounters the danger of late frost, it can spray water to wash away the thick cream adhering to the tea tree to avoid or reduce the frost damage. 2. After the frozen tea tree is frozen, the tea tree must be subjected to freezing injury, and corresponding measures of care and rejuvenation must be taken according to the frozen conditions to restore the tree as soon as possible. After the temperature has warmed up, the frozen leaves will be trimmed immediately and cut to below the freezing-damaging branches. This will not only prevent the entire shoot from dying, but also stimulate the germination of budding or adventitious shoots under the cut, which will help restore the vigor of the tea tree and restore it as soon as possible. produce. In addition, for the frozen tea gardens to strengthen fertilizer management, can apply nitrogen available fertilizer, appropriate with the application of phosphorus and potassium fertilizer, can also be sprayed foliar fertilizer to promote germination and enhance tree vigor.
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