On October 12th, when the reporter interviewed the town of Haicang in Dali County, Shaanxi Province, he discovered that 11 acres of farmer households with the same name of Han lived in the peach orchard of a few rows of peach trees on both sides of the mantle and grew well. In the middle of the block, there are more than a dozen peach trees whose leaves all turn red, in stark contrast to other trees. In response to this phenomenon, members of the Expert Advisory Group of the newspaper and Lu Pinghui, an expert in fruit mixing at the Northwest Agriculture and Forestry University, believe that this symptom is a clear peach deficiency.
He explained that potassium-deficit peaches first attacked the leaves in the middle of the shoot, and then gradually began to develop toward the base and the apex, generally gradually increasing from bottom to top. In severe conditions, the whole tree is wilt and the resistance is reduced. The leaf margin is yellow at the beginning and the color is yellowish green. In the later period, the leaf margins continued to turn yellow, while the mesophyll tissues continued to grow, the main veins shrank, the leaves rolled up, brown necrotic spots appeared near the leaf margins, and the backs of the leaves turned red. The shoots are long and thin, with few flower buds and small fruit.
What is the cause of peach potassium deficiency in the end? Lu Ping thinks that in the soil with fine sandy soil, acidic soil, and organic matter, it is easy to show deficiency of potassium. Excessive lime application in sandy soil can reduce the availability of potassium. When applying nitrogen fertilizer to soils with mild potassium deficiency, the growth of fruit trees is stimulated and potassium deficiency disease is more likely to be manifested. Potassium deficiency in orchards, in addition to the lack of potassium in the soil, the lack of other elements or interactions can also cause potassium deficiency.
In this regard, experts have specifically reminded fruit growers to increase organic fertilizers, such as soil fertilizer or straw, in order to avoid shortage of potassium. In the growing season of fruit trees, planting ash or potassium dihydrogen phosphate may be applied from June to July, and the leaves and fruits may return to normal.
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