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Spraying concentration should be appropriate. The suitable concentration of foliar fertilization is: urea 1%-2%; potassium dihydrogen phosphate 0.2%-0.5%; ammonium sulfate 0.2%-0.3%; borax 0.03%-0.1%; superphosphate 1%-2%; rice vinegar 0.3%; rare earth 0.3% - 0.1%.
The spraying site should be suitable. The key part of the spraying of the leaf top dressing is the young stems and leaves of the vegetables, and the front and back sides should be sprayed, and should not be sprayed or re-sprayed.
The spraying period should be appropriate. Leafy vegetables are generally applied in the early and middle stages of growth; solanaceous fruits, melons, beans, and roots are generally applied in the middle and late stages.
The number of sprays should be appropriate. Generally, the foliar top dressing is carried out 2-3 times, once every 7-10 days.
Spray time should be appropriate. Foliar topdressing should be sprayed on sunny days when the sun is not too strong, so as to extend the wet time of the fertilizer on the vegetables and improve the fertilizer efficiency. If the rain is 3 hours after spraying, it should be replenished after the weather, but the concentration should be appropriate. reduce.
Fertilizer should be mixed. When the vegetable leaf top dressing is applied, two or more kinds of fertilizers are reasonably mixed, and the yield increasing effect is remarkable. However, it should not be mixed arbitrarily. For example, potassium dihydrogen phosphate cannot be mixed with rare earth. The filtered human excrement cannot be mixed with the ash leaching solution, and zinc phosphate cannot be mixed with superphosphate.
It is advisable to choose fertilizer. For leafy vegetables, urea and potassium dihydrogen phosphate are used. For soy fruit and melon vegetables, nitrogen, phosphorus and potassium mixed liquid or multi-component compound fertilizer is used. For root vegetables, phosphorus and potassium fertilizers are used.
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