apocrenic

(such as apocrenic acid) derived from the humus overlying the rocks in which the crystals were formed.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

The fluid from which they have been precipitated contains two substances, crenic and apocrenic acids, while the soil still retains what has been called insoluble humus.

Elements of Agricultural Chemistry Thomas Anderson

This is sustained by the fact that the crenic, apocrenic and humic acids, though often partly uncombined, are never wholly so, but usually occur united in part to various bases, viz.: lime, magnesia, ammonia, potash, alumina and oxide of iron.

Peat and its Uses as Fertilizer and Fuel 1869

In fact, the oxidation and consequent removal of these soluble matters (crenic and apocrenic acids,) is likely to proceed more rapidly than they can be produced from the less soluble humic acid of the peat.

Peat and its Uses as Fertilizer and Fuel 1869

It is, however, probable that organic acids (crenic and apocrenic,) and nitric acid were also produced (by oxidation,) and shared with carbonic the work of solution.

Peat and its Uses as Fertilizer and Fuel 1869

The crenic and apocrenic acids (that are formed by the oxidation of ulmic and humic acids,) have such decided acid characters, -- crenic acid especially, which has a strongly sour taste -- that we cannot well doubt their dissolving action.

Peat and its Uses as Fertilizer and Fuel 1869

To this day there is a division of opinion among scientific men on this subject, some adopting the views of Liebig, others maintaining that certain soluble organic matters, viz., crenic and apocrenic acids are proper food of plants.

Peat and its Uses as Fertilizer and Fuel 1869

It is seen that the amount of carbon diminishes from ulmic acid to apocrenic, that of oxygen increases in the same direction and to the same extent, viz.: about 21 _per cent. _, while the hydrogen remains nearly the same in all.

Peat and its Uses as Fertilizer and Fuel 1869

Thus the inert matters that resist the immediate solvent power of alkalies, absorb oxygen from the air, and form the humic or ulmic acids soluble in alkalies; the humic acids undergo conversion into crenic acid, and this body, by oxidation, passes into apocrenic acid.

Peat and its Uses as Fertilizer and Fuel 1869

Furthermore, as Dr. Vœlcker has shown us, during the fermentation of the manure in a heap, ulmic and humic, crenic and apocrenic acids are produced, and these unite with the ammonia and “fix” it -- in other words, they change it from a volatile gas into a non-volatile salt.

Talks on Manures A Series of Familiar and Practical Talks Between the Author and the Deacon, the Doctor, and other Neighbors, on the Whole Subject Joseph Harris 1860