This solvent separates the humic and ulmic acids from the undecomposed vegetable fibers.
humic, hū′mik, adj. denoting an acid formed by the action of alkalies on humus or mould.
The residues, which are insoluble in water, but redissolve in ammonia, have the properties of humic acids.
A small portion of nitrogen unites with hydrogen, forming ammonia, which remains combined with the humic and other acids.
His peat or humic acid tannage was patented by him about 1905, and is now worked on a commercial scale.
We are well aware that the nitrogen present in the humic matter of the soil is readily nitrifiable.
This deposit, if obtained from light brown peat, is ulmic acid; if from black peat, it is humic acid.
The second class of substances formed are soluble organic acids, such as humic and ulmic acids.
In soils that are acid through the accumulation of humic acid nitrification does not go on, and bacterial life is repressed.