Compared with other fruit trees, the content of nitrogen, phosphorus, potassium, calcium and magnesium in blueberry trees is very low, so we should pay attention to prevent excessive fertilization and avoid fertilizer damage. In addition, blueberries are very sensitive to soluble fertilizers, and too much will lead to plant injury and death.
The amount of fertilization should be determined according to the growth, age and yield of fruit trees in blueberry orchard. Different blueberry orchards apply different amounts of fertilizer, but there is one principle that needs to be mastered: fruit trees with more fruits should be applied more, and fruits should be applied less; Small trees should be used less, and big trees should be used more.
Extended data:
Blueberries can grow many times in a growing season, and secondary growth is more common. In southern China, blueberries have two growth peaks in a year, the first is from May to June, and the second is from mid-July to mid-August.
In the third year after planting, the growth of seedlings was obviously accelerated, and the new branches germinated and grew vigorously, and the annual growth could reach more than 1 m. Flower buds are mostly formed at the top of branches in the current year, and flower buds differentiate downward from the top. The number of flower buds that can be differentiated per branch is related to the variety and branch thickness.
The flower bud differentiation period of various blueberries is different. Dwarf blueberry and tall blueberry began to differentiate from July to August, and rabbit-eye blueberry began to differentiate from mid-June. By the end of September to the beginning of 10, the flower bud differentiation of blueberry had been completed.