Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regionsNote 112 — Chapter XVIII · THE PHYSICO-CHEMICAL INVESTIGATION OF SOILS IN RELATION TO CROP PRODUCTION.Reading editionIbid. VI. p. 411.◇Copy noteReturn to CHAPTER XVIII. THE PHYSICO-CHEMICAL INVESTIGATION OF SOILS IN RELATION TO CROP PRODUCTION.