Reasons for the yellow leaves of the tree

After the peach trees were harvested, they were re-shrinked and pruned. In some facilities, the peach leaves appeared yellow in the whole park. The reasons were mainly as follows.

1. Pruning is too heavy and nutrition supply is seriously misaligned. Before the fruit is harvested, the nutrients produced by the leaves of the peach tree provide most of the fruits for growth and development. The nutrients that flow back to the tree and the root system are few, and the fruit is trimmed immediately after pruning. At this time, the storage of nutrients in the tree is relatively small, coupled with the sudden loss of retractable foliage, the tree is severely traumatized, and the respiration, photosynthesis, and transpiration of the tree itself are severely weakened, resulting in aging of the root system, and less new roots. The ability to absorb nutrients also dropped sharply, resulting in a serious shortage of nutrients on the tree, and there were symptoms such as yellowing of the shoots and malnutrition.

Second, Peach tree iron deficiency caused a lack of iron leaf elements, chlorophyll synthesis blocked, yellow leaves. Because iron is not easy to flow in the peach tree, iron deficiency begins with the young leaves of the peach tree. The first is the yellowing of the leaf, while the veins remain green, and the leaves are green and reticular. In severe cases, the entire leaf turns white, and rust-brown patches or leaf margin scorch appear in the green part.

3. Toxic substances poison roots, affect absorption of nutrients and prune too much, causing massive root deaths. Dead roots produce toxic substances in the process of spoilage hydrolysis, poisoning young roots and inhibiting the production of new roots, thereby reducing the ability of roots to absorb nutrients, resulting in The tree is maladjusted and yellow leaves.