From the beginning of germination, the apple tree begins to absorb roots and can absorb roots until late April. The main factors that restrict the occurrence and activity of root absorption are the storage nutrient level and the temperature of the ground. The "new year tree" spring new root activity is late, the amount is small. Increasing the storage nutrient level of the tree, using the mulching film and other measures to increase the ground temperature can promote the early absorption of roots in spring, which is very beneficial for germination, leaf spreading, prescribing and fruit setting. The "small year tree" with low storage nutrient level (the previous year is the "big year"), the amount of root absorption in spring is small, and the nutrients absorbed by the root system alone are still difficult to meet the needs of the previous tree. Top dressing before and after germination can make up for the lack of storage nutrition, and is an effective way to improve the fruit setting rate and promote the growth and development of the early stage.
After the end of April, the amount of growth roots began to rise and reached its peak in mid-May, which lasted until the spring shoots stopped. A weak-growing tree that topdresses before the peak of the roots can promote the growth of new shoots and help restore the tree. Wang Changshu wants to control the fertilizer and water, which is necessary to suppress the growth of new shoots and promote flowers.
After the spring shoots stop, about the end of May, the beginning of June, until July, the summer peak of the new roots. It is the period with the largest amount and the longest duration of new roots in the middle of the year. At this time, it is the flower bud differentiation stage. Wang Changshu and "Golden Year Tree" are suitable for topdressing and can promote flower bud differentiation.
After the fall of the autumn shoots in late August, until the leaves, it is the autumn peak of the new roots. The tree load and leaf retention have the greatest impact on the amount of new roots. The results were too much, the leaves were falling early, and the amount of autumn roots was significantly reduced. The occurrence of autumn roots is closely related to the storage of trees. Fertilization in autumn promotes the occurrence of autumn roots, which is conducive to improving the storage and nutrition level of trees.
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