Classification of fertilizers: by nutrient element content
1, elemental fertilizer: in the fertilizer nutrients, only has a nutrient element marked amount of nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, etc. collectively. Such as urea, ammonium sulfate, ammonium bicarbonate, superphosphate, double superphosphate, potassium sulfate and potassium chloride and other elemental fertilizers; copper sulfate, borax, zinc sulfate, manganese sulfate, ferrous sulfate and ammonium molybdate and other trace elements of elemental fertilizers.
2. Compound fertilizer: among the three nutrients of nitrogen, phosphorus and potassium, there are at least two kinds of fertilizers made by chemical methods or blending methods, which are the general term of compound fertilizer and mixed fertilizer. Such as a variety of compound (combined) fertilizer.
3, compound fertilizer: nitrogen, phosphorus, potassium 3 kinds of nutrients, at least 2 kinds of nutrients marked amount of fertilizer made only by chemical methods. Such as monoammonium phosphate, diammonium phosphate, phosphate nitrate, potassium and potassium dihydrogen phosphate.
4, mixed fertilizer: 2 or 3 kinds of nitrogen, phosphorus, potassium fertilizer, or compound fertilizer and nitrogen, phosphorus, potassium fertilizer in 1~2, can also be allocated to the amount of trace elements, through the mechanical mixing method of the fertilizer. Can be divided into granular mixed fertilizer, powder mixed fertilizer and mixed stick fertilizer. Such as a variety of special compound fertilizer.
5. Formula fertilizer: using soil testing formula technology, according to the nutritional needs of different crops, soil nutrient content and fertilizer supply characteristics, using various elemental fertilizers or compound fertilizers as raw materials, adding appropriate amounts of medium and trace elements or specific organic fertilizers in a targeted manner, etc. It is a special fertilizer processed by blending or granulation technology, with strong pertinence and regional characteristics.