(1) Soil topdressing
In the early spring when the nitrogen fertilizer supply is lacking, the new shoot growth period (early May) can be used to add nitrogen to the young trees. Apply 50-100 grams of urea per plant and 100-150 grams of 2-3 year-old plants. Plants that grow too weak and too effective are 1 kg per plant. Irrigate torrents after application to ensure the growth of branches, leaves and young fruits. Nitrogen and water are still controlled for Wangchangshu.
Multi-element compound fertilizer or nitrogen, phosphorus, and potassium compound fertilizer shall be applied universally at the end of May or early June. Irrigate small water after application to create conditions with more fertilizer and less water to facilitate flower bud differentiation.
(2) Spray fertilizer outside the roots
For newly planted plants, since the new roots are just beginning to grow, the number is small, and the fertility absorption is weak. After spreading the leaves (early May), spray 0.3%-0.5% urea once every 10 days, and spray 2-3 Times to promote the growth of seedlings.
Spray 0.5% urea and 2% superphosphate leaching solution, 0.4% potassium chloride (potassium sulfate) mixture, or 0.5% urea and 0.4% potassium dihydrogen phosphate on the young trees and effect trees that will be effective. Flower bud differentiation and fruit growth. Nowadays, some biostimulants are also used for processing in production.
(3) Pay attention to trace elements
Calcium deficiency affects cell division and cell wall composition, so the new roots are stubby, curved, and die quickly. The lack of chlorophyll in magnesia causes leaf chlorosis, growth stagnation, abnormal young development and fruit ageing, and yellow-green to yellow-white patches appear between the veins of the base leaves, which then turn into brown patches. Iron deficiency makes young leaves chloroplasts develop abnormally, the mesophylls become chlorosis, and the veins are still green.
In severe cases, the leaves are small and thin, and the mesophyll is yellow-green, yellow-white or milky white: as the disease worsens, the veins of the leaves also turn green and yellow, and brown spots or edges appear together, and they gradually die off. When zinc is deficient, the auxin content in the tree is low, and the cells absorb less water and cannot elongate. The top leaves of the new shoots are narrow, the branches are slender, the internodes are shortened, and the leaves are full of clusters, small and narrow, brittle and thick, often called lobular disease.
The trace element does not mean that it is not important, especially at this stage the soil condition is not good, and the balance of mineral elements is out of balance. It can be recharged by soil application and leaves.
(4) Water management
The new shoots should have sufficient water supply during the growth period at the beginning of May. Control the water from the end of May to the beginning of June. If the leaves do not wilt and do not irrigate, the weather is too dry and only small water is irrigated.
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