[Autumn Base Fertilization] Why is autumn base fertilization recommended for fruit trees?
Release Date:
31 Mar,2026
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Abstract
Fruit trees such as apple and pear trees expend substantial amounts of nutrients and water over the course of a year as they bloom, set fruit, produce new shoots and leaves, and develop expanding fruits and blossoms. A single tree may yield 200 to 300 jin of apples or pears in a year, with the branches and foliage adding another few hundred jin; all of these dry materials are synthesized from the water and nutrients absorbed by the root system. As everyone knows, vigorous trees bear larger fruits, while weak trees produce smaller ones—vigor stems from strong roots, whereas weakness reflects weak roots. Therefore, to cultivate a robust tree, one must first strengthen its roots.
Several factors influence the vigor of a tree, including winter pruning and the number of flower buds; moreover, root system vigor is closely linked, particularly to the amount of stored nutrients accumulated this year. As the crown expands annually and the main and lateral leader shoots continue to grow each year, the underground root system must also extend accordingly to maintain overall tree vigor. Therefore, the length and vigor of this year’s root growth will determine next year’s tree vigor. Of course, the following points further underscore the importance of applying basal fertilizer in autumn:
1. Apple trees experience three peak periods of root growth each year; however, the first two are relatively brief, with the third—beginning in late August and peaking in September—lasting until the soil freezes.
2. In early September, mid-early maturing varieties have already been harvested, and late-maturing varieties are also nearing maturity. Shoot growth on the trees has ceased, and even vigorously growing trees with excessive autumn shoot development are approaching the end of shoot elongation. At this stage, all the nutrients synthesized by the leaves throughout the tree are directed toward storage. Therefore, the earlier the base fertilizer is applied in autumn, the longer the leaves will remain functionally active, allowing for greater nutrient accumulation in storage.
3. At the same time, as we enter September, the diurnal temperature range widens, which further promotes nutrient storage. However, it is important to note that applying base fertilizer earlier is more beneficial than applying it later: for the same amount of money spent on fertilizer, early application results in stronger and longer-lasting leaf function, leading to more extensive root growth; conversely, late application leads to shorter roots. Therefore, the timing of base-fertilizer application makes a significant difference in its effectiveness.
4. Applying base fertilizer in autumn while deliberately pruning the roots is akin to a “pruning” of the root system; just as winter pruning involves shortening the branches to stimulate vigorous growth, cutting back the roots in early autumn encourages the development of new roots, and a well-developed root system in turn leads to even more vigorous tree growth.
5. Fruit trees are biennial crops; applying a base fertilizer in the autumn is intended to maximize nutrient storage for the following year and to promote more extensive root growth. After harvest, you’ll often observe that the tree appears “exhausted,” and the older the leaves become, the faster their functional capacity declines. However, after autumn fertilization, leaf function improves markedly, enabling the tree to synthesize more nutrients for storage.
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