May and June are the key stages of the annual nutrient management of apple trees. This period of fertilization can determine the output and quality of apple in the same year, and at the same time it has a close connection and influence on the output of the second year.
The first task is the expansion of young fruit. Since May, Apple has entered the first period of young fruit expansion. The demand for NPK in the first stage of apple fruit expansion period began to increase. This period needs a relatively adequate supply of NPK balanced, and it is the key to decide the size of the whole fruit. At the same time, this stage is also the peak period for fruit trees to absorb calcium throughout the year. By supplementing the high-absorption and utilization of calcium fertilizer, it is also a key measure to determine the appearance of apple.
The second task 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 synergistically promote the increase in the number of root hairs. Therefore, in these phases, sufficient water-soluble phosphorus, effective phosphorus and simultaneous stimulation of calcium and boron are the key to ensure the health of the root system, and it is also the key to determine whether or not fruit trees can produce high yields.
The third task is to stop the new shoots and increase the area of ​​the leaves. This period requires a certain amount of nitrogen and magnesium to ensure the quality of the leaves, and a reasonable leaf-fruit ratio can ensure the apple's yield. Therefore, the promotion of leaf thickness and reasonable leaf area at this stage, prevention of some leaf diseases is the key.
The fourth task is flower bud differentiation. In the Yuncheng area of ​​Shanxi Province, from the middle of May onwards, the growth of young fruit trees gradually slowed down and gradually began to enter the flower bud differentiation period. This stage must have sufficient nutrient supply and a reasonable ratio of nitrogen, phosphorus and potassium to ensure the fruit trees. The number and quality of flower buds. Phosphorus can promote flowering, water-soluble effective phosphorus is the key to promote flowering; in addition nitrogen is also an essential element of flower bud differentiation, nitrogen deficiency may cause the proportion of malformed flowers to rise; potassium can increase the activity of flowering enzymes; another leaf spray The application of trace elements such as Zinc, Boron, Molybdenum, etc. are all helpful to the flower bud differentiation. Flower bud differentiation is a complex process. Each key node will affect flowering, but artificial adjustment through reasonable nutrient supply is the key.
At the same time, phosphorus supplementation is the key in May and June, and it is the first measure to promote flower bud differentiation and overcome the size of the year. Modern fruit industry
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