1.physiological acid fertilizer. In the aqueous solution of chemical fertilizer, herbage absorbs too many cations from the fertilizer, and the remaining anions generate corresponding acids, making the solution acidic. Most ammonium and potassium salts belong to this kind of fertilizer.

2. physiological alkaline fertilizer. If the anions absorbed and utilized by forage are faster than the cations absorbed and utilized, the cations in the soil solution are surplus, and the corresponding alkaline compounds are generated, making the solution alkaline, such as calcium nitrate, magnesium nitrate, etc., which belong to alkaline fertilizers.

3. physiological neutral fertilizer. Forage absorbs anions and cations at approximately the same rate, and the soil solution is neutral, such as potassium nitrate, ammonium nitrate, urea, etc. According to the composition of nutrients, chemical fertilizers can be divided into: nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, compound fertilizer, trace elements, etc. Chemical fertilizers can be divided into base fertilizer and top dressing fertilizer according to their use.

In addition, chemical fertilizers can also be divided into quick acting fertilizer, slow acting fertilizer and long-acting fertilizer. Fertilizer for soil, foliage, etc.