In the past two years, the phenomenon of pear stems and leaves appeared in the pear plots of Nanwangzhuang Village, Pangu Township, Qingxian County. The symptoms were as follows: the beginning of the pear was a main branch or a part of the lateral branch of the leaves, similar to the symptoms of potassium deficiency or injury, and then The entire leaf is chlorogenic and dry, and eventually the leaves spread to cause the entire tree to dry off.
Under the guidance of the technical staff of the county forestry service center, the causes of the injury of the phytotoxicity and the leaf disease were excluded. After careful investigation, it was suspected that the disease was caused by root diseases or improper fertilization.
First, due to root diseases. When surveyed by the farmer Wang Mingshan's pear orchard, the tree neck was covered with white mycelium, which was initially determined to be caused by white peony disease. 0.3% potassium permanganate solution or multiple Bordeaux mixture can be used to irrigate the roots. However, in the pear farms of other farmers, there was no abnormality in the appearance of the tree roots and the appearance of tree roots.
Second, due to improper fertilization. In the past few years, this phenomenon also occurred in other pear orchards in Qing County, and the soil was detected as excessive chloride ions. After carefully inquiring about the fruit growers in the pear orchard, they all learned that compound fertilizers were used. The compound fertilizers purchased in the agricultural capital market contained mostly potassium chloride. Some of them were labeled as potassium sulfate and actually contained potassium chloride. Farmers did not. Identifying ability. Pear trees and other fruit trees are chlorine crops, and long-term use of such chlorine-containing compound fertilizers will cause soil chloride ions to exceed the standard, resulting in debilitating tree vigor and falling leaves.
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