Yellowing of walnut leaves, also known as yellowing disease, is a common disease in alkaline soil. The main reason is that the soil in the walnut seedling orchard is alkaline or contains too much calcium carbonate, which causes the iron in the soil to change from soluble to insoluble form. The fruit tree has insufficient iron absorption, and the physiological state in the body is out of balance. The synthesis of chlorophyll is blocked and the appearance is yellow. Chemical disease. In the spring growth period, you can spray 0.3% ferrous sulfate + 0.3% to 0.5% urea mixture 2 to 3 times, or use 0.5% ferric fulvic acid solution 2 to 3 times. At the same time, add ferrous sulfate to the organic fertilizer, mash the coarse fertilizer, mix it, and apply it under the tree tray by ditching. Generally, the tree is 10 years old and the plant is about 250 grams.
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