Foliar fertilization is based on soil fertilization, but it is generally not a substitute for base fertilizer. Because the nutrients applied by the foliar fertilizers, particularly the large number of elements, account for only a small part compared with the crop requirements. For example, spraying corn or wheat with 2-3 times of 0.5%-1% urea can only meet 5%-10% of total nitrogen requirement. Therefore, the foliar fertilizer can only be used as an auxiliary means for soil fertigation. The mutual cooperation, complement each other.
All kinds of foliar fertilizers can be applied at different growth stages, but different growth stages have different roles and requirements. Seedling seedlings are tender and their spraying concentration is low, and they are mainly controlled by small and medium-sized elements; in the middle and later crops, the spraying concentration can be higher, and nitrogen, phosphorus, and potassium foliar fertilizers are the main factors. The main purpose is to prevent late defermentation, increase production and quality.
For example, when wheat encounters hot and dry weather in the late period, it can spray 0.3% potassium dihydrogen phosphate solution, 0.5% urea solution, and pesticides to prevent premature senescence, dry hot wind, diseases and insect pests, and increase grain weight.
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