Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regions

CHAPTER XV.

Chapter 1929 wordsPublic domain

COLORS OF SOILS, 283.—Black Soils, 283.—“Red” Soils, 284.—Origin of Red Tints, 285.—White Soils, 285.—Differences in Arid and Humid Regions, 286.—White Alkali Spots, 286.