Fertilization points of fruit trees in different growth stages
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The unsuccessful young trees are mainly to enlarge the canopy and accumulate tree nutrients. During this period, the amount of growth was small, and the amount of fertilizer required was small, but it was very sensitive to the fertilizer reaction. If malnutrition is at this stage, it will be difficult to make up even if it is doubled later. It is necessary to apply sufficient phosphorus fertilizer and appropriate application of nitrogen fertilizer and potassium fertilizer, which is one of the key measures for early fruiting and early yielding of fruit trees.
In the initial stage of the results, as the root crown continues to expand, to maintain a more vigorous vegetative growth, it is necessary to apply more nitrogen fertilizer. During this period, it is necessary to continue to expand the canopy and promote flower bud differentiation. Therefore, phosphorus and potassium fertilizer should be properly applied on the basis of nitrogen fertilizer application.
As a result of the adult tree in its prime, the main purpose of fertilization is to maintain high quality and high yield of fruit and increase its commodity value. Because the results are more and the flower bud differentiation in successive years, the proportion of phosphorus, potassium and calcium fertilizer should be increased. Therefore, fertilization should pay attention to the combination of nitrogen, phosphorus, potassium and calcium fertilizers, especially to increase the proportion of potassium fertilizer and maximize the fruiting period.
After the fruiting period, the tree gradually ages. In the old age, more nitrogen fertilizer should be applied. The proportion of nitrogen fertilizer application should be the same as that of the young tree to promote renewal and rejuvenation.
Huaxian Agricultural Technology Center Liu Xiuling