a fertilizer of inorganic origin, applied to soils or to plant tissues to supply one or more plant nutrients essential to the growth of plants.

a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms

a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)