1. Generally, nitrogen fertilizer (N) is N)25-30kg, phosphorus fertilizer (P2O5) is 7-10kg, and potassium (K2O) is 7-10kg per mu, which is equivalent to 65-75kg of urea, 50-75kg of calcium superphosphate and 6544 of potassium sulfate.
The amount of fertilizer applied to tea trees should also be determined according to the age of the tree, the potential of the tree, the amount and frequency of leaf picking, and the soil conditions. Generally, it should be applied less when it is young or leaves are not picked. In the prime of life, more leaves and poor soil should be applied. According to the basis provided by the Institute of Soil and Fertilizer of Guangdong Academy of Agricultural Sciences, the amount of fertilizer applied per mu is shown in the table.
(1) The annual fertilization amount is distributed in proportion to the fertilization period;
(2) According to the calculation of 400 tea trees per mu, when the number of shrubs increases or decreases, the amount of fertilization can also increase or decrease; ③ According to the three elements contained in fertilizer types, the application amount of different fertilizers can be calculated.
2. Fertilization time
(1) base fertilizer: tea base fertilizer is generally applied in autumn and winter (9-165438+1October), mainly organic fertilizer and phosphate fertilizer, and the application amount accounts for 40% of the annual fertilization amount. Apply about 65,438+0,000 kg manure or 26-30 kg urea, 50-70 kg calcium superphosphate and 65,438+00 kg potassium sulfate per mu. After the above fertilizers are evenly mixed, combined with winter ploughing, the roots of tea trees are applied into ditches or holes.
(2) Topdressing: In the active period after tea growth, topdressing should be carried out in batches from February to March to September, that is, before spring tea (February to March), summer tea (May) and autumn tea (July). Topdressing is mainly nitrogen fertilizer, and potassium fertilizer is applied once before the Spring Festival. Specific topdressing situation is as follows.
Each topdressing is in February-March, with about 20kg of urea and 0/0kg of potassium sulfate/kloc per mu. After all the above fertilizers are mixed evenly, mix them with 3-5% water solution to water the roots.
The second topdressing was in mid-May, and about 7 kilograms of urea was used per mu.
The third topdressing is in the first ten days of July. Urea is applied at a rate of about 14kg per mu, which can be made into 2-3% aqueous solution. Combined with intertillage planting, it is applied through root watering. You can also apply fertilizer outside the roots. You can spray 0.5% urea and 1-2% calcium superphosphate water and fertilizer solution (after the fertilizer solution is stirred and dissolved, let it stand overnight and spray it on the leaves with clear solution), and the fertilizer solution is about 200 kg per mu.