From May to June, it has entered a critical stage of nutrient management for apple trees throughout the year. Fertilization in this period can determine the output and quality of apples in that year, and is closely related to the output of the next year. According to the characteristics of apple tree's fertilizer requirement at this stage, providing sufficient nutrients for the fruit tree will lay a solid foundation for improving fruit quality and increasing yield.
Nitrogen, Phosphorus and Potassium-Promote the expansion of young fruit
From May to June, Apple's first task at this time is to enlarge the young fruit. At this time, the fruit has changed from a nitrogen nutrition period to a sugar nutrition period, requiring a large amount of nutrient water supply. Therefore, during the fruit expansion period, it is necessary to ensure that there is sufficient water and balanced nitrogen, phosphorus, and potassium nutrients, so that the fruit expands rapidly, the color is good, and the phenomenon of fruit drop and splitting is reduced. This stage is the peak period for calcium absorption by fruit trees throughout the year. Supplementing calcium fertilizer with high absorption utilization rate is one of the key means to determine apple quality. At this time, calcium fertilizer needs to be supplemented every 7 to 10 days.
Calcium supplementation for fruit trees in a timely manner can effectively prevent the weakening of the young leaves of the fruit trees, the leaves become green and yellow, the fruit has sunken spots and the flesh discolors, becomes soft, bitter, bitter pox, etc., can significantly improve the quality and yield of the fruit .
Calcium supplementation-stimulate root growth
This is the second peak of root growth. In the three stages of fruit tree root growth, phosphorus is the key. Secondly, boron and calcium can stimulate the development of the root system and cooperate to promote the increase in the number of root hairs. As mentioned earlier, the role of timely supplementation of calcium fertilizers, and at the same time, adequate supplementation of sufficient water-soluble phosphorus and boron, and simultaneous stimulation of multiple nutrients are the key to ensuring the health of the root system and the key to determining the high yield of fruit trees.
Boron is a nutrient element necessary for the growth of fruit trees. Although the dosage is not large, the effect is remarkable. The test proves that: apple, pear, peach, grape are sprayed twice with boron fertilizer at the flowering stage and the young fruit stage, and the fruit setting rate can be increased by 1-4 Times, can reduce fruit shrinkage disease, high yield and good quality.
Nitrogen and magnesium increase-expand leaf area
In addition to boron supplementation, a certain amount of nitrogen and magnesium are needed to ensure the quality of the leaves, and a reasonable leaf-fruit ratio can ensure apple output. Therefore, at this stage, the thickness of the leaf and the reasonable area of ​​the leaf are promoted, and prevention of some leaf diseases is the key.
High potassium supply-to ensure nutrient conversion
From the end of May to the beginning of June, the spring shoots enter the natural stop period, 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 is necessary to have sufficient nutrient supply and a reasonable ratio of nitrogen, phosphorus and potassium to ensure the quantity and quality of flower buds of fruit trees.
In addition, grasping the growth characteristics of fruit trees in this period, combined with high-potassium compound fertilizers and high-potassium-type water-soluble fertilizers, can help stimulate the growth of fruit trees and strengthen the enzyme's role in sugar, starch, protein, fat and various vitamins. Synthetic operation. It can stimulate the activity of polysaccharide enzymes and convert polysaccharides into soluble monosaccharides, thereby improving the sweetness and quality of fruits.
After the fruit is bagged, 300-350 times of potassium dihydrogen phosphate is sprayed every 7 to 10 days to supplement tree nutrition and enhance photosynthesis, so that the fruit can be supplemented in a timely manner and the nutrients obtained are comprehensive, and the effect is better. After the fruit is harvested, spray 0.5% urea and 0.3% potassium dihydrogen phosphate every half month, which can be combined with the prevention and control of diseases and insect pests.
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