Generally 3 ~ 4 times a year, depending on the size of the tree. The first time was in February-March in early spring, applying thin and quick-acting fertilizer to trees, and applying 0.5-0.8 kg of bayberry special fertilizer to each tree to meet the needs of sprouting, flowering and fruiting of spring shoots, but this time no fertilizer was applied to young trees; The second time, in late May, the available nitrogen fertilizer and potassium fertilizer were mainly used, and 0.5 ~ 1 kg special nitrogen and potassium fertilizer was applied to each plant to promote fruit hypertrophy. After the third fruit harvest, July-August is the flower bud differentiation development period of Myrica rubra. Timely application of postharvest fertilizers plays an important role in supplementing tree nutrients and promoting flower bud differentiation. Take 20-30-year-old trees as an example, each plant is applied with 3-5 kg or 0.5- 1 kg of special fertilizer, 2.5-3 kg of potassium sulfate or potassium chloride and 0.5 kg of calcium superphosphate. For the fourth time, from September to June, 10, the base fertilizer was applied with soil digging and hole expanding, and 25-30 kg of stable manure, compound microbial fertilizer 1 kg and 2-3 kg of special fertilizer were applied to each plant. For mountainous areas lacking organic fertilizer or inconvenient transportation, 2 ~ 4 kg of bayberry special fertilizer can be applied to each plant while digging and expanding holes and applying green manure. In addition, Nonghai brand amino acid compound micro-fertilizer can be sprayed in July-165438+10, once every10 day, usually 3-4 times. It can enhance the stress resistance of trees and promote high quality and high yield.