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The chemical nature and distribution of black pigment in soil

The chemical nature and distribution of black pigment in soil
William Sherman Gillam

1938

Department of Agronomy and Horticulture, University of Nebraska – Lincoln, Lincoln NE 68588, UNITED STATES OF AMERICA.

ABSTRACT

As used in this paper, humus refers to that portion of the soil organic matter peptized by four per cent ammonium hydroxide. That fraction peptized by four per cent ammonium hydroxide, precipitated by acids, and insoluble in alcohol, is designated as black pigment. It is called humic soil by many writers.