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 where soil acidification occurs can be improved by applying dolomite powder, quicklime, etc.;
(4) Combined with high-yield and high-quality cultivation techniques.
2. Fertilization amount and method
(1) General production of tea garden: nitrogen fertilizer (N) 20 ~ 30 kg / mu, phosphate fertilizer (P2O5) 4 ~ 6 kg / mu, potash fertilizer (K2O) 6 ~ 10 kg / mu.
(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: choose sulfur-containing fertilizers such as sulfur
Ammonium acid, potassium sulfate, superphosphate, and the like.
Fertilizer is applied in divided doses. Base fertilizer: mainly organic fertilizer, phosphorus, potassium and magnesium, trace element fertilizer, and apply 30% to 40% of nitrogen fertilizer for the whole year. After the end of the tea season, it will be applied before the end of September to the end of October. Application, application depth is about 20 cm; topdressing: mainly based on nitrogen fertilizer, germination fertilizer applied 30 days before the spring tea, accounting for 30%~40% of the annual dosage, summer tea topdressing in the end of spring tea Before the tea begins to grow, it is usually in the middle and late May, and 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, and the dosage is about 20% of the whole year.
Expert Group on Soil Testing and Formula Fertilization Technology of the Ministry of Agriculture
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