How to effectively spray foliar fertilizer on beans, melons and fruits, and flower ball vegetables?

Foliar fertilizer is a fertilizer applied to the leaf surface directly with the nutrients needed by the crop for the purpose of absorption through the leaves, and is called foliar fertilizer. Its scope of application is very wide, but most of it is used on melons and fruits, beans and flower ball vegetables, so how to spray foliar fertilizer on beans, melons and fruits, and flower ball vegetables?

1. These vegetables should be given mainly multi-element compound fertilizer of nitrogen, phosphorus and potassium, which should both promote vegetative growth and build up a high-yield framework, and coordinate reproductive growth to achieve high yield and good quality.

2. These vegetables have a relatively balanced demand for nitrogen, phosphorus and potassium. Suitable foliar fertilizers include potassium dihydrogen phosphate solution or 1% urea mixed with 2%-3% superphosphate extract and 0.5% potassium sulfate, sprayed 2-3 times in the middle and late stages of vegetable growth; rare earth micro-fertilizer can also be used for spraying.

3. Spraying boron fertilizer on solanaceous fruit vegetables is beneficial to flowering and fruit setting; spraying boron and molybdenum fertilizer on flower ball vegetables such as cauliflower is beneficial to the growth and development of the flower ball; bean vegetables are sensitive to boron and molybdenum, and spraying boron and molybdenum fertilizer is beneficial to flowering and pod setting; spraying potassium dihydrogen phosphate solution on cucumbers can effectively inhibit the occurrence of downy mildew and also reduce deformed cucumbers.