Symptoms The plants have thin stems, small leaves, yellow leaves, weak growth, less fruit setting, poor fruit development, low yield, and weak resistance to disease and stress.
Analysis For the summer vegetables, improper fertilization is the main cause of premature aging of plants. If the use of organic fertilizer is not paid before planting, the phenomenon of de-fertilization and premature aging will occur in the middle and late stages of plant growth and development. At the same time, if the application of organic fertilizer is not paid attention to the application of chemical fertilizer on one side, the soil compaction is often caused, and the permeability of the soil is reduced. It is easy to cause root growth and dysplasia, causing premature aging; excessive use of nitrogen fertilizer, resulting in root injury, making the plant thin, stunted, premature aging, if the root is not injured, it is easy to cause the plant to grow long, make the crop premature aging; The concentration of the soil solution is increased, causing salt damage, affecting root growth, which leads to insufficient supply of water and nutrients required for plant growth, causing premature aging.
Prevention In order to prevent vegetable root injury, it is necessary to eliminate the above fertilization method and achieve scientific fertilization. Scientific fertilization: On the basis of the application of organic fertilizer, the appropriate amount of fertilizer should be applied according to the growth demand of crops, and nitrogen fertilizer should not be applied. For example, when the tomato is fertilized in the final stage, the ratio of nitrogen to potassium is most suitable at 1:2, and 30 kg of compound fertilizer can be applied per acre. Remedy: After the crop has premature aging, it should be remedied by a combination of spray and irrigation. The upper spray, that is, the foliar spray of foliar fertilizer. Foliar spray can be carried out by using NPK nutrient foliar fertilizer and cytokinin 400 times solution. Under irrigation, that is, rooting agent or microbial fertilizer is applied to promote the growth of roots and enhance the ability of roots to absorb water and fertilizer. After the plants return to normal, the topdressing is carried out in time according to the crop growth demand.
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