In the production and management of peach trees, there are many factors affecting iron absorption, mainly the following:
① There is insufficient oxygen in the soil. Peach tree roots breathe more actively. For example, if peach trees are planted in sticky or hardened soil, the soil is not loose and the air permeability is poor, which will cause insufficient oxygen, and the roots of peach trees will turn yellow due to respiratory obstruction.
② Too much water in the early growth stage of peach trees can also cause difficulty in root respiration.
③ The soil salt content is too high. Peach trees planted in heavy saline-alkali land often have yellow leaves.
(4) Excessive application of nitrogen or phosphorus fertilizer will also affect the absorption of iron by peach trees, leading to yellowing of leaves.
(5) overweight pruning. Excessive thinning of large branches in winter and imbalance of root-shoot ratio will also cause yellowing of peach leaves.
⑥ There are pests and diseases in the root system, or immature organic fertilizer is applied. In some peach orchards, the application of organic fertilizer is immature or uneven, and the fertilizer is directly applied to the root system, which burns the root system and causes the peach leaves to turn yellow.
The method to solve and prevent peach yellow leaf disease is:
(1) Detect whether there is iron deficiency in the soil, and if there is iron deficiency in the soil, apply a proper amount of ferrous sulfate to supplement it; If there is no iron deficiency, we should consider the influence of human factors.
③ Applying organic fertilizer and liquid fertilizer to completely change soil structure and increase soil organic matter is the most fundamental and effective measure to control peach yellow leaf disease.
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