Chemical fertilizers can be classified according to their properties:
Physiological acid fertilizer.
In the aqueous solution of chemical fertilizer, herbage absorbs too much of the fertilizer, and the remaining anions produce the corresponding acids, which make the solution sour, and most of the ammonium salt and potassium salt belong to this kind of fertilizer.
2. Physiological alkaline fertilizers.
If the use of the grass absorption of the anion than the absorption of cationic, the soil solution in excess of cation, the formation of the corresponding alkaline compounds, so that the solution into alkaline, such as calcium nitrate, magnesium nitrate, etc. belong to alkaline fertilizers.
3. Physiological Neutral fertilizer. The rate of the absorption of anions and the absorption of cations by herbage is roughly equal to the neutral reaction of the soil solution, such as potassium nitrate, ammonium nitrate and urea. According to the composition of nutrients, chemical fertilizers can be divided into: nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, compound fertilizer, trace elements and so on.
Chemical fertilizers can be divided into: basal and top dressing according to the application. In addition, chemical fertilizers can be divided into quick-acting fertilizer, slow-effect fertilizer, long-term fertilizer. Soil fertilizer, foliar fertilizer and so on.