| 释义 |
su·per·phosphate
\ˌsüpə(r)+\ noun
Etymology: super- + phosphate
: any of various commercial phosphate fertilizers obtained as white to gray granules or powders by acidulating ground insoluble phosphate rock: as
a. : a product made by acidulating with sulfuric acid, consisting essentially of soluble primary calcium phosphate, calcium sulfate, and smaller amounts of secondary calcium phosphate, and containing usually about 20 percent of available phosphoric acid — called also acid phosphate, ordinary superphosphate
b. : a product made by acidulating with phosphoric acid, consisting essentially of primary calcium phosphate, and containing usually 40 to 50 percent of available phosphoric acid — called also concentrated superphosphate, double superphosphate, treble superphosphate, triple superphosphate |