What form of phosphorus does the crop absorb? What is the form of phosphorus in the soil?

The crops mainly absorb orthophosphate (H2PO4-, HPO4, PO4), which absorb H2PO4-the most, in addition can also absorb metaphosphate (PO3-) and pyrophosphate, (P2O7-4), but the quantity is limited; some organic Phosphorus compounds such as hexose, sucrose phosphate, nucleic acids and glycerophospholipids can also be absorbed.
Phosphorus in the soil is divided into inorganic and organic states. Generally inorganic phosphorus is more than organic phosphorus, and inorganic phosphorus accounts for 50-90% of total phosphorus. There are more than 30 kinds of inorganic phosphorus in the soil, but can be summarized into the following three categories:
(1) The water-based phosphorus compounds mainly include alkali metal phosphates or alkaline earth metal phosphates of the first generation, such as KH2PO4, NaH2PO4, Ca(H2PO4)2, Mg(H2PO4)2, etc. This is a form that the crop easily absorbs, but the soil content less.
(2) Weak acid-soluble phosphorus compounds are mainly alkaline earth metal secondary phosphates such as CaHPO4, MgHPO4, etc. Phosphorus crops of this form can also be absorbed and utilized.
(3) Insoluble phosphorus compounds are mainly fluoroapatite [Ca10(PO4)6F2], chloroapatite [Ca10(PO4)6Cl2], aluminophosphate [Al(OH)2H2PO4], pink alkali iron ore [Fe (OH)2H2PO4], etc., Phosphorus content of this form the most, but the crop is difficult to absorb and use.
The above three types of phosphates can be transformed into each other in the soil. There are many amorphous ferric phosphates, [FePO4XH2O] and crystalline pink pyrite in the acid soil, with low calcium phosphate content. Ferric phosphate is an important source of phosphorus in paddy soils in the red soils of southern China. In acidic soils, many poorly soluble phosphates and small amounts of weak acid-soluble phosphates are often surrounded by iron-aluminum oxide films to form so-called closed-up phosphorus. This form of phosphorus is difficult to release and is absorbed by crops.

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