Control of fruit tree replantation disorders

At present, the fruit tree production has the problem of irrational breed structure, the proportion of late-maturing varieties is too high, and the proportion of early-maturing varieties is very low. Therefore, the adjustment of the structure of fruit trees is imperative.
In China's major fruit tree production areas, most of the orchards have entered an ageing period, and many trees planted in orchards have been starved of trees. Now that the branches are dry, the decline of the tree vigor is common, and the yield is low and the income is very low. If the orchard is destroyed, the land is used for other purposes. There are also new orchards built in the same place. In situ reconstruction of orchards will result in the replantation of fruit trees.
In the same orchard, after the excavation of the fruit trees, the same or similar fruit trees are replanted. The replanting of trees will result in the inhibition of growth or serious diseases. This phenomenon is known as the obstacle of fruit tree replantation, also known as continuous obstacles or euphemistic phenomenon.
The performance of the replantation disorder is that the young trees grow weak, the roots are stunted, the branches are dwarfed, the branches are shortened between the nodes, the drawing is difficult, the leaves are chlorotic, and the leaves are reduced.
The reason for the replantation disorder is that the roots of the fruit tree secrete and release a large amount of metabolites into the soil during the growth process or decline, and after years of accumulation, reaching a certain concentration, the mutual repulsion of the fruit trees will be toxic. , Forming obstacles to replantation; Planting the barnyardgrass causes the distribution of certain nutrients, especially certain trace elements, to be out of balance, and certain special nutrient elements may not be given or surplus, which may also lead to replantation disorders. In addition, abnormal soil acidity, increased nematodes and pathogens can also cause replantation disorders.
When replanting fruit trees to eliminate obstacles to replantation, they should select suitable post-fruit trees. The same tree species should not be planted again; remove residual roots, dead branches, fallen leaves, and weeds in the garden of fruit trees or fruit seedlings, and burn them centrally or deeply. To build an orchard on the original orchard land, deep plowing should be done first to remove the residual roots of the fruit trees, and to avoid planting trees in the original planting trees. If the soil cannot be changed, the soil must be disinfected; the fermented and decomposed organic fertilizer should be added to increase the soil organic matter content and promote the soil. The breeding of antagonistic bacteria, rational application of nitrogen fertilizers, application of phosphorus, potassium fertilizers and trace elements to improve disease resistance of fruit trees; lime application, adjustment of soil pH, etc., can all play a role in controlling and eliminating the adverse effects of replantation of fruit trees.

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