Phosphorus fixation occurs in soil by means of

Answer: Option D

Phosphorus fixation refers to the conversion of the phosphorus element into a fixed compound or absorbed by plants that are further unavailable for use. It occurs in soil using:

Intercrystalline adsorption- adsorption of phosphate takes place on the surface of constant charge which interacts with phosphorus mainly through the cations held tightly to their plate-like surfaces and on the surfaces of variable charge.

Isomorphous substitution- through this process the mechanism of the phosphate fixation is by the replacement with hydroxyl or silicate anions up to a certain amount of silicate released from the tetrahedrons.

Double decomposition- based on the solubility product principles, a variety of reactions is significant in the fixation of soluble phosphates. However, the formation of insoluble precipitates of the phosphatic compound will depend on the pH of the system.