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The Chemical Nature And Distribution Of Black Pigment In Soil, William Sherman Gillam
The Chemical Nature And Distribution Of Black Pigment In Soil, William Sherman Gillam
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
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.