Active and auxiliary components of chemical fertilizers

Active ingredient refers to the major fertilizer nutrients in fertilizers can be absorbed by crops used, the weight percent of the element to be expressed, such as nitrogen% of nitrogen, phosphorus pentoxide% phosphorus and potassium hydroxide to % said nitrogen fertilizer - represents potassium% - phosphorus pentoxide. In addition to the main nutrients, other components contained in the fertilizer are called sub-components, such as ammonium sulfate containing 20 % to 21 % of nitrogen. For the purpose of applying nitrogen fertilizer, sulfate is a by-component; the active ingredient of superphosphate is phosphoric acid. The hydrate of calcium dihydrogenate Ca ( H 2 PO 4 ) 2 · H 2 O and a small amount of free phosphoric acid, and the accessory component is anhydrous calcium sulfate.