Tea trees are magnesia plants and require more magnesium than normal plants. Coal shortage not only affects the yield of tea, tea leaves affect inclusions, resulting in decreased quality, adverse famous tea production. Symptoms of tea deficiency in coal: Firstly, it occurs from the lower leaves of tea leaves, which occurs in the long-term germination of tea shoots and shoots. The tip of tea leaves begins to retreat green and yellow, and then expands to the middle of the leaves and the base. The initial veins remain green, only The mesophyll turns yellow. When it is serious, the whole leaves turn yellow, the young shoots sprout slowly, and the color is not green. Reasons for the lack of magnesium in tea trees: First, the soil in tea gardens is deficient in magnesium. Second, the long-term application of chemical fertilizers in tea gardens , no application of organic fertilizer, and the absorption of magnesium in the soil was not compensated. Third, high-yield tea gardens applied a large amount of nitrogen, phosphorus and potassium fertilizers, and did not increase the application of magnesium fertilizer, resulting in nutritional imbalance. The fourth is excessive application of calcium, potassium and ammonium fertilizers in tea gardens , which has an antagonistic effect with magnesium and inhibits the absorption of magnesium by tea trees. The method of applying magnesium fertilizer to tea trees: (1) In combination with applying germination fertilizer in early spring, 30 kg of calcium magnesium phosphate fertilizer per acre is applied . Yield tea spring and also after a first batch picking, calcium magnesium phosphate 25 kg per acre, or administration of milk vetch (containing 1% MgO) 60 supported modulation compost. (2) Spraying 0 on the leaf surface of the tea tree with obvious symptoms . 5% magnesium sulfate solution. Adding calcium magnesium phosphate fertilizers and agricultural home. (3) In the autumn of each year, apply 80 to 100 tons of organic fertilizer such as manure and compost , or 150 to 200 kg of tea seed cake per acre . After several years of application, it can be stopped for 1 year.
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