There are many diseases in the greenhouse, and spraying is essential. Many vegetable farmers often use foliar fertilizers when spraying. The use of foliar fertilizers and pesticides for compounding not only saves labor and labor, but also increases the nutrition of plants, and improves the resistance of plants to a certain extent, and plays an auxiliary role in the prevention and control of diseases. However, many vegetable farmers have improper use of pesticides and foliar fertilizers, causing problems such as phytotoxicity. The result is counterproductive. So, what do you need to pay attention to when spraying pesticides and foliar fertilizers?
First of all, we must choose the appropriate type of foliar fertilizer according to the growth of the plant and the occurrence of the disease. When plants grow stronger or weaker, they should be used in conjunction with growth regulators. Plants with symptoms of nutrient deficiency or at the critical period of certain nutrient elements should focus on the use of this type of nutrient-type foliar fertilizers, such as tomatoes should be combined with calcium fertilizer when the appearance of umbilical rot, boiled bean should be combined with boron before. When the plants grow normally, the main choice of full-foliage foliar fertilizer is to prevent disease and spray, which can quickly supplement leaf nutrients and promote plant growth. When the pesticide is sprayed after the disease occurs, it is more suitable to use amino acid and nucleotide type foliar fertilizers, which can directly supplement leaf nutrient, increase plant resistance, and assist disease prevention and treatment.
Second, pay attention to the order of pesticides and foliar fertilizers. Foliar fertilizers, especially nutrient-type foliar fertilizers, are many in the form of ions. However, if the ion concentration is too high, it will easily cause pesticides to react with them and precipitates, which will affect the efficacy. Therefore, when pesticides are used together with foliar fertilizers, the foliar fertilizers should be diluted with water first, and then other pesticides should be mixed in order of wettable powder, suspending agent, liquid agent, and emulsifiable concentrate in order to reduce precipitation and other reactions. It may be less risky. Dilution of pesticides before they are introduced can further reduce risks. When foliar fertilizers and pesticides are mixed, they must be used together with them, and they must not be reused.
In addition, it should be noted that the foliar fertilizer can not be mixed with any pesticide. For example, copper preparations should not be mixed with inorganic nutrient-type foliar fertilizers. Copper preparations act through copper ions. Various ions contained in inorganic nutrient foliar fertilizers affect the rate of precipitation of copper ions and influence Efficacy. Foliar fertilizers such as amino acids and nucleotides are mostly weakly acidic and should not be mixed with alkaline pesticides.
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