from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An acid phosphate.
- n. A mixture of gypsum and monobasic calcium phosphate resulting from the action of sulfuric acid on phosphate rock, used as a fertilizer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fertilizer produced by the action of concentrated sulfuric acid on powdered phosphate rock.
from the GNU version of the Collaborative International Dictionary of English
- n. An acid phosphate.
from The Century Dictionary and Cyclopedia
- n. A phosphate containing the greatest amount of phosphoric acid that can combine with the base.
- n. 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.
- n. A trade-name of superphosphate of lime.
_ The term superphosphate is applied to the phosphates that have been treated with sulphuric acid to make the phosphoric acid available.
When this phosphate is acted upon with sulphuric acid, a soluble phosphate is formed, as Liebig first showed, to which the name superphosphate has been given, and which is also known as monobasic phosphate of lime, or monocalcic phosphate.
“Then we have what we call superphosphate, or acid phosphate of lime, or more properly monocalcic phosphate.
_ -- Under this name a kind of superphosphate, which is understood to be made by dissolving a native "rock guano," has recently attracted considerable attention, and is used to a large extent.
The fertilizer called superphosphate contains these in the form of mineral salts.
It is soluble in water, and gives to the commercial article known as superphosphate of lime its value.
The deliberate adulteration of superphosphate, that is, the addition to it of sand or similar worthless materials, I believe to be but little practised.
Sulphuric acid converts the phosphate rock into superphosphate, which is soluble and available for plant use.
But the other is what is called superphosphate of lime, which will dissolve in water; so that the roots of the plants can suck it up: and that is one of the richest of manures.
The Phosphatic class, such as superphosphate, basic slag, and steamed bone flour.
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