In the early autumn (from mid-August to late September), the base fertilizer is the second growth (fruit stage) or the third (sapling stage) growth of the roots of the fruit trees. The root regeneration ability is strong, and the roots with a diameter of 1 cm or less are fertilized. After 20 days, new roots can be emitted to absorb soil nutrients and water, which is conducive to the safe wintering of fruit trees.
In early autumn, the temperature is suitable, the soil moisture is large, the microbial activity is strong, the fertilizer is decomposed and decomposed quickly, the mineralization degree is high, and it is easily absorbed by the roots, especially for spring flowering and fruit setting in the spring of the next year.
In the early autumn, the autumn shoots of the fruit trees have basically stopped. After the application of the base fertilizer, the quick-acting part can be absorbed and utilized by the roots, which not only enhances the function of the leaves, but also stores most of the photosynthetic products in the trees, enriching the tissues and flower buds. Conducive to the safe winter of fruit trees. At the same time, in the spring of the next year, the fruit trees sprouted early, the leaves were fast, the leaves were large and thick, the photosynthesis ability was strong, and the nutrient exchange period was not obvious, which was conducive to fruit tree flowering, fruit setting and flower bud differentiation. The slow-acting part of the base fertilizer, after the autumn, winter and spring, is also transformed into nutrients that can be absorbed by the roots of the fruit trees. It can exert fertilizer effect in spring, which is conducive to fruit tree flowering, fruit setting and spring shoot growth.
Practice has proved that the effect of applying base fertilizer in early autumn is obvious. The flowering period can be advanced two days, 1-2 flowers account for 98%, flowering is concentrated, easy to pollinate, the fruit setting rate is as high as 73.2%, and the fruiting rate of base fertilizer in late autumn is only 24.7%.
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