tea tree 1. Fertilization problems and fertilization principles Insufficient amount of organic fertilizer input in tea gardens, poor soil and poor water retention and fertilizer retention capacity, some tea gardens use high levels of nitrogen fertilizer, insufficient proportion of phosphorus and potassium fertilizers, and lack of medium and trace elements such as magnesium, sulfur and boron, and some tea gardens in South China and other tea areas. Excessive application of nitrogen fertilizer has led to problems such as soil acidification, and the following fertilization principles are proposed: (1) Adding organic fertilizer, organic and inorganic combined application; (2) According to soil fertility conditions and yield levels, appropriately reduce the amount of nitrogen fertilizer, strengthen the combined application of phosphorus, potassium and magnesium fertilizers, and pay attention to the supplement of nutrients such as sulfur and boron; (3) Tea gardens with a serious soil acidification (pH<4.0) can be improved by applying dolomite powder, quicklime, etc.; (4) Combined with high-yield and high-quality cultivation techniques. 2. Fertilization advice (1) General production of tea gardens: nitrogen fertilizer (N) 20~30 kg/mu, phosphate fertilizer (P2O5) 4~6 kg/mu, potash fertilizer (K2O) 6~10 kg/mu. The above fertilization amount includes nutrients in the organic fertilizer. (2) Magnesium, zinc and boron tea gardens: soil application of magnesium fertilizer (MgO) 2~3 kg/mu, zinc sulfate (ZnSO4·7H2O) 0.7~1 kg/mu, borax (Na2B4O7·10H2O) 1 kg/mu. (3) Sulfur-deficient tea garden: Select sulfur-containing fertilizers such as ammonium sulfate, potassium sulfate, and superphosphate. Fertilizer operation for the whole year. In principle, organic fertilizer, phosphorus, potassium and magnesium are mainly based on autumn and winter base fertilizers, and nitrogen fertilizer is applied in different times. The base fertilizer is applied with all organic fertilizers, phosphorus, potassium, magnesium, trace element fertilizers and nitrogen fertilizers which account for 30%~40% of the annual amount. The suitable period of fertilization is between the end of September and the end of October after the end of the tea season. Deep tillage application, the application depth is about 20 cm. Topdressing is generally based on nitrogen fertilizer. The topdressing period is determined according to the growth of tea trees and tea picking conditions. The germination fertilizer is applied about 30 days before the spring tea, accounting for 30%~40% of the annual dosage. Summer tea topdressing in spring tea Before the end of summer tea begins to grow, generally in the middle and late May, the dosage is about 20% of the whole year. The autumn tea topdressing is carried out after the end of summer tea, generally applied in the middle and late July, the dosage is about 20% of the whole year. . For the only spring tea, not the summer and autumn tea garden, the amount of nitrogen fertilizer is reduced, which can be determined according to the low end of the above-mentioned fertilization dosage; at the same time, the annual fertilizer management is appropriately adjusted, and the annual dosage is applied before the end of spring tea and deep (heavy) pruning. 20% of nitrogen fertilizer, and then applied nitrogen fertilizer once in the end of July of that year, the dosage is about 20% of the whole year. This article URL: Guilin's guidance on scientific fertilization of tea trees in autumn and winter of 2015 Zhuhai Mingke Electronics Technology Co., Ltd , https://www.zhmkdz-electronics.com