superphosphate

An acid phosphate.

A mixture of gypsum and monobasic calcium phosphate resulting from the action of sulfuric acid on phosphate rock, used as a fertilizer.

A trade-name of superphosphate of lime.

A phosphate containing the greatest amount of phosphoric acid that can combine with the base.

A trade-name for various phosphates, such as bone, bone-black, and phosphorite, which have been treated with sulphuric acid to increase their solubility, and so render them more available in agriculture as fertilizers.

An acid phosphate.

a fertilizer obtained by trating bone dust, bone black, or phosphorite with sulphuric acid, whereby the insoluble neutral calcium phosphate, Ca3(PO4)2, is changed to the primary or acid calcium phosphate Ca(H2PO4)2, which is soluble and therefore available for the soil.

A fertilizer produced by the action of concentrated sulfuric acid on powdered phosphate rock.