Nitrogen, Phosphorus, Potassium Fertilizer - Promotes Inflation
From May to June, at this time, Apple's first task is to enlarge the fruit. At this point, the fruit has changed from a nitrogen trophic period to a sugar vegetative period and requires a large amount of nutrition and water supply. Therefore, it is necessary to ensure that there is sufficient water and a balanced nutrient of nitrogen, phosphorus and potassium during the fruit enlargement, so that the fruit quickly expands, the color is good, and the phenomenon of fruit drop and fruit cracking is reduced. This stage is the peak period for fruit trees to absorb calcium throughout the year. One of the key measures to determine the quality of apples is to supplement calcium fertilizers with high absorption and utilization. In this case, calcium fertilizer should be applied once every 7-10 days. Timely calcium supplementation for fruit trees can effectively prevent the growth of young leaves of fruit trees from weakening, leaves chlorosis, fruit subsidence spots and discoloration of pulp, softening, bitter and so on, can significantly improve fruit quality and yield.
Boron-calcium - stimulates root growth
This is the second peak of root growth. Phosphorus is the key in the three stages of fruit tree root growth. Secondly, boron and calcium can stimulate the development of the root system and synergistically increase the number of root hairs. The role of timely supplementation of calcium fertilizers has already been mentioned. At the same time, adequate supplements of sufficient water-soluble phosphorus and boron, as well as simultaneous stimulation of various nutrient elements, are the key to ensuring the health of the root system, and also the key to determining whether or not fruit trees can produce high yields.
Boron is the necessary nutrient element for fruit tree growth. Although the amount is not large, the effect is significant. Tests have shown that apples, pears, peaches and grapes are sprayed twice with boron at flowering and young fruit stages, and the fruit setting rate can be increased by 1-4. Times, can also reduce the shrinking fruit disease, high yield, good quality.
Magnesium-enhanced magnesium - expanding leaf area
In addition to boron supplementation, this period requires a certain amount of nitrogen and magnesium to ensure blade quality, and a reasonable leaf-fruit ratio can ensure apple yield. Therefore, the promotion of leaf thickness and reasonable leaf area at this stage, prevention of some leaf diseases is the key.
For high potassium - to ensure nutrient conversion
From late May to early June, the spring shoots enter the natural stop for a long time, which is the critical period for the physiological differentiation of apple flower buds. Management during this period is the focus of Apple's annual management. It must have sufficient nutrient supply and a reasonable ratio of nitrogen, phosphorus and potassium to ensure the number and quality of flower buds in fruit trees.
In addition, grasping the growth characteristics of fruit trees during this period, in combination with high-potassium compound fertilizers and high-potassium-type water-soluble fertilizers, will help stimulate the growth of fruit trees and strengthen enzymes for sugar, starch, protein, fat and various vitamins. Synthetic operation. It stimulates the activity of polysaccharidase and converts the polysaccharide into soluble monosaccharides, thereby increasing the sweetness and quality of the fruit.
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