Precautions for topdressing of vegetable roots

First, the choice of fertilizer: the top of the top dressing should choose a fertilizer with a greater solubility, commonly used fertilizers are urea, superphosphate, potassium dihydrogen phosphate, rare earth, spray Shibao, harvest and so on.
Second, the application method: generally using spray fertilization, the selected fertilizer is added with water, formulated into a fertilizer solution sprayed evenly on both sides of the blade.
Third, the use concentration: according to the variety of the choice of the appropriate concentration, the applicable concentration of urea is 0.2-1.5%, the applicable concentration of superphosphate is 1-3%, the suitable concentration of potassium dihydrogen phosphate is O.2-0.4%, the application of rare earth The concentration is O.01-0.05%, and the sprayed treasure is used with 5 ml of water for 55 kg per acre, and the harvest is 10-20 ml per acre, and 60 kg of water.
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