superphosphates

The Exposition of that year widened the horizon, by making France acquainted with the agricultural importance of the English fabrication of 'superphosphates' as fertilisers.

France and the Republic A Record of Things Seen and Learned in the French Provinces During the 'Centennial' Year 1889 William Henry Hurlbert 1861

J.B. Lawes manufactured superphosphates (1842); Chilean sodium nitrate beds exploited from c. 1870 until methods of fixing atmospheric nitrogen were developed after 1900 by Fritz Haber (1868–1934); use of potash as an inorganic fertilizer from Strassfurt deposits.

d. Agricultural Production and Food Technology 2001

At the present moment, however, very little of the superphosphates sold in the market are made exclusively from bones in their natural state, by far the larger portion being manufactured from mineral phosphates, or from bones after destruction of their organic matter, sometimes with the addition of small quantities of unburnt bones, but more frequently of sulphate of ammonia, to yield the requisite quantity of ammonia.

Elements of Agricultural Chemistry Thomas Anderson

The composition of superphosphates must necessarily vary to a great extent, and depends not only on the materials, but on the proportion of acid used for solution.

Elements of Agricultural Chemistry Thomas Anderson

Bone ash has hitherto been almost entirely consumed as a raw material for the manufacture of superphosphates; but as it is sold at from £4:

Elements of Agricultural Chemistry Thomas Anderson

Although there is no manure which varies more in quality, or requires greater vigilance on the part of the purchaser, in order to obtain a good article, there is no doubt that superphosphates, owing to the process of manufacture being better understood, and to increased competition, have considerably improved in quality.

Elements of Agricultural Chemistry Thomas Anderson

A variety of substances are sold under the name of nitrophosphate, potato manure, cereal manure, etc. etc., which are all superphosphates, differing only in the proportion of their ingredients, and in the addition of small quantities of alkaline salts, sulphate of magnesia, and other substances, but they present little difference from ordinary superphosphates in their effects.

Elements of Agricultural Chemistry Thomas Anderson

Peruvian guano; insoluble phosphates in coprolites; and soluble phosphates in superphosphates, made from bone-ash alone.

Elements of Agricultural Chemistry Thomas Anderson

Coprolites are seldom used alone for the manufacture of superphosphates, but are generally mixed with bone-ash and bone dust.

Elements of Agricultural Chemistry Thomas Anderson

_ -- These names were at first applied to bones which had been treated with sulphuric acid; but superphosphates are now rarely made from bones alone, but bone ash and some of the mineral phosphates just described are employed, either along with them, or very frequently alone.

Elements of Agricultural Chemistry Thomas Anderson