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The concentration of foliar fertilizer should not be high at the early stage of plant growth. The concentration of urea at the seedling stage should not exceed 0.3%. The concentration of urea at the middle and late stages can be properly increased. For example, urea can be sprayed with 0.5% solution, but it should not be high, so as to avoid excessively high concentrations causing fertilizer damage. When formulating the foliar fertilizer solution, high-quality chemical fertilizers with good solubility and less impurities should be selected, and the community test should be conducted before formal application, and there should be no large-scale application after abnormal problems. When foliar fertilizers are sprayed with pesticides at the same time, special attention should be paid to the fact that acidic fertilizers cannot be mixed with alkaline pesticides, and alkaline fertilizers cannot be mixed with acidic pesticides, so as to avoid the decrease of the effectiveness of pesticides or the occurrence of phytotoxicity due to acid-base reactions. In addition, the spraying of foliar fertilizers should not be performed temporarily at high temperatures before and after sunny noon, so as to avoid the influence of leaf evaporation due to rapid evaporation of water, and the phenomenon of leaf burning occurs.
Method for fertilizer on watermelon foliage
In the middle and late stages of watermelon growth, due to slow root growth and gradual decline in function, the ability to absorb nutrients tends to weaken. This period is an effective supplement to the nutrients required for the rapid growth and development of fruits, usually by applying foliar fertilizer. supplement. The types of foliar dressing are mainly nitrogen, phosphorus and potassium. The nitrogen can be sprayed with 0.3% to 0.5% urea solution on the surface of the nitrogen supplement, and the potassium fertilizer is sprayed with 0.4% to 0.5% potassium sulfate solution to make up the leaves. Surface spray 0.4% ~ 0.5% of the superphosphate extract, can also be used 0.3% potassium dihydrogen phosphate solution.