Precautions for vegetable leaf topdressing and fertilization points

First, the fertilizer variety should be suitable. There are many kinds of fertilizers suitable for vegetable foliar fertilizer. Commonly used are urea, potassium dihydrogen phosphate, superphosphate, potassium phosphate, zinc sulfate, rice vinegar, borax, rare earth and ash leaching liquid, etc., and volatile and poorly soluble fertilizers are not suitable. Such as ammonium bicarbonate, calcium magnesium phosphate fertilizer.

Second, the depth of the spray fertilizer should be suitable. The suitable concentration of fertilizer on the leaf surface 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%.

Third, the amount of sprayed fertilizer should be sufficient. When spraying, the leaves of the plant are evenly covered with misty small water droplets, which is not suitable for dripping, generally 40-60 kg of fertilizer solution per acre. Vegetable leaf top dressing attention and key to fertilizer.

Fourth, the spraying site should be appropriate. 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 are sprayed, and no spray or re-spray is allowed.

Fifth, the application period should be suitable. 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.

Sixth, the number of spraying should be appropriate. Generally, the foliage is applied 2-3 times, once every 7-10 days.

Seven, pay attention to the application time. Foliar top dressing is selected in the sunny afternoon when the sun is not too intense, in order to extend the warming time of the fertilizer on the vegetables, improve the fertilizer effect, such as rain 3 hours after spraying, after the weather, it is necessary to make up the spray, but the concentration should be appropriate reduce.

8. Fertilizer should be reasonably applicable. When the vegetable leaf surface is topdressed, two or more kinds of fertilizers are reasonably mixed, and the yield increase effect is remarkable. However, it can 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.

9. Fertilizer should be applied reasonably. Spraying a phosphorus-containing fertilizer such as superphosphate, after soaking for 24 hours, dilute the supernatant to 1% to 2% and spray it. The potassium fertilizer is diluted with the grass ash supernatant after soaking for 2 hours and then sprayed.

10. Select suitable fertilizers based on vegetable varieties. Leafy vegetables, such as cabbage, celery, spinach, etc., use urea, potassium dihydrogen phosphate, etc.; solanaceous fruits, melon vegetables such as tomatoes, cucumbers, etc., mostly use nitrogen, phosphorus, potassium mixed liquid or multi-component compound fertilizer Rhizome vegetables, such as potatoes, radishes, onions, etc., use phosphorus and potassium fertilizers.

The above is the key point of vegetable leaf top dressing and the key to fertilizer. Unsuitable fertilizer can only be counterproductive. We can refer to these introductions and combine scientific training to make scientific and reasonable fertilizer. Only scientific and reasonable fertilizer can help the healthy growth of crops, improve quality and increase yield. Please pay attention to us for more crop culture training techniques and fertilizer tips. We hope to help us!