The fruit enters the expansion period, which is the key period for determining the fruit yield, quality and how much fruit to sit next year. Fruit enlargement, sweetening, coloring and flower bud differentiation nutrition can not be reduced or delayed. The flower buds of most deciduous fruit trees are formed in the year before or during the previous growing season. The yield of fruit trees is largely determined by whether the meteorological conditions and cultivation practices of the previous year are conducive to the formation of adequate and full flower buds.
Second, grasp the time of topdressing
From June to October, it is the peak period of flower bud differentiation. Flower bud differentiation is a fairly long process, which is divided into physiological differentiation stage and morphological differentiation stage. Fruit enlargement also requires adequate nutrients. The early expansion of the fruit is mainly to increase the number of cells, and the late expansion is mainly due to the increase of cell fluid. In other words, the more cells there are, the bigger the fruit will be in the future. In June and July, the nutrient is insufficient, and the formation of a large number of cells will seriously affect the size of the fruit and the amount of sugar at the time of harvest. Therefore, fertilizer application must be completed before June-July. Because the applied fertilizer can not be directly used by plants, the various elements contained need to be absorbed by the roots of the plants and transported to the leaves. Through the photosynthesis of the leaves, the assimilated nutrients are produced to supply the fruit trees for expansion, sweetening, coloring and Flower bud differentiation. This requires a period of time, delay or delay, which will inevitably affect the expansion of the fruit and the formation of flower buds.
Third, what fertilizer to pursue
A lot of practice has proved that which fertilizer to choose depends on the actual situation of the fruit tree. However, high potassium functional fertilizer can not be lacking, and zinc, copper, boron, molybdenum, cobalt and other trace elements are also indispensable. It can promote the expansion of crop fruits, significantly increase the weight and yield of single fruit; enhance the taste, fruit shape, Fruit quality, fruit brightness and other fruit quality; effectively prevent late maturity and early fruit market time; supplement other nutrients needed for crops to prevent falling, fruit drop, fruit cracking, hollow fruit, leaves caused by malnutrition Physiological diseases such as yellowing, lobular disease, fruit umbilical rot, heart rot. In particular, it is conducive to the formation of a moderate amount of full flower buds.
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