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Potassium metaphosphate [KPO3, (KPO3)] n) It is a high composition phosphorus potassium compound fertilizer, with a theoretical content of 39.87% potassium oxide and 60.13% phosphorus pentoxide. Pure potassium metaphosphate is a white fibrous crystal with a melting point of 810 ℃. Its molecular weight and physical properties are related to the manufacturing method. The solid-state structure of potassium metaphosphate is composed of unbranched P-O-P chains, surrounded by four oxygen atoms around a phosphorus atom in an equilateral tetrahedron. There are two forms of potassium metaphosphate that can remain stable at room temperature: one is fibrous Kurrol's salt crystals, and the other is vitreous products.

Potassium metaphosphate is an ideal chlorine free phosphorus potassium compound fertilizer. It has the following characteristics:
1. It does not absorb moisture and has an anti caking effect. Adding potassium metaphosphate with a mass fraction of 10-50% to other fertilizers can greatly reduce its caking phenomenon.
2. It can provide different solubility according to the needs of crops, and can slowly or controlled release fertilizer effects, which is beneficial for environmental protection.
3. It has multiple chelating abilities in liquid mixtures and is an ideal raw material for liquid fertilizers.
4. The salt index is very low and there is no residual soil effect.
5. Due to the nodulation effect of polyphosphate, it can reduce soil phosphorus fixation and potassium loss. At the same time, adding an appropriate amount of trace elements can make a multi-element efficient composite fertilizer.