The normal growth and development of crops require multiple trace elements. Based on the application of nitrogen, phosphorus, and potassium fertilizers, reasonable application of trace fertilizers should be based on local soil conditions. The typical symptoms and control measures of crops lacking trace elements are described below:
Symptoms of boron deficiency: poor root development, growth point and young leaves curled and deformed, the leaves become harder, floral organs are not well developed, and are easy to fall off. Such as various crops, "flower but not real" disease, radish, broccoli, "brown rot", celery, "stem disease," and so on.
Prevention and control measures: Usually with 0.05%-0.2% borax solution foliar spray. To cruciferous crops and vegetables, fruit trees, etc. need more boron.
Symptoms of zinc deficiency: Plants are short, rust spots appear in the middle leaves of rice, and gradually expand into strips. In severe cases, the leaves become chlorotic, some of them become gray and necrotic, and finally the appearance of "rape"; the young leaves of fruit trees become smaller and smaller. Green spots, clusters of leaves, "lobular disease"; corn "flower white leaf disease" and so on.
Prevention and control measures: Use 1 kilogram to 2 kilograms of zinc sulfate per acre as a base fertilizer or foliar spray with 0.1%-0.2% zinc sulfate solution.
Deficiency of molybdenum symptoms: poor growth, plant dwarf, chlorosis between leaves or veins, such as the lack of molybdenum tomatoes when the edge of the upward curl, the formation of white and gray spots and litter; citrus was spotted chlorosis, maculopathy.
Prevention and control measures: Generally use 0.01% 0.1% ammonium molybdate solution, spraying 1 time or 2 times in seedling stage and legume stage, each time between 7 days and 10 days.
Iron deficiency symptoms: manifested as "chlormia deficiency" or "chlorosis." At the beginning, the leaves and leaves of the leaves turned yellow and the veins were still green. After that, the entire leaves became completely green. The fruit trees have long-term iron deficiency, and the top of the tree is dead.
Control measures: Generally, 0.2%-1% ferrous sulfate solution is used for foliar spraying.
Symptoms of Mn deficiency: Light yellow spots appear first on young leaves. The tender leaves become pale and grayish. After that, some brown spots appear at the tips of the leaves, and they gradually spread to other parts of the leaves. Finally, the leaves curl yellow.
Control measures: Generally, 0.05%-0.1% manganese sulfate solution is sprayed on the leaves for 2 times or 3 times, each time between 7 days and 10 days.
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