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Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regionsHilgard, Eugene W. (Eugene Woldemar)

Science

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

Name: Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regions
Author: Hilgard, Eugene W. (Eugene Woldemar)

Hilgard, Eugene W. (Eugene Woldemar)

Soils

CHAPTER XX.
     SOILS OF THE ARID AND HUMID REGIONS, 371.—Composition of
        Good Medium Soils; Table, 371.—Criteria of Lands of
        the Two Regions, 371.—Tables of Soil-Composition in
        Both Regions, 372.—Soils of the Humid Region governed
        by Time, 374.—Soils of the Arid Region Governed by
        Moisture, 374.—Lime and Magnesia Uniformly High in Arid
        Soils, Despite Scarcity of Limestone Formations; Potash
        also High, 374.—_General Comparison of the Soils of the
        Arid and Temperate Humid Regions_, 375.—Basis of Same,
        376.—New Mexico and Analysis of Soil, 376.—General Table,
        377.—Discussion of the Table, 378.—_Lime_; Summary of
        Physical and Chemical Effects of Lime Carbonate in Soils,
        378.— Discussion of Summary, 379.—_Magnesia_: Its role
        in Plant Nutrition, 381.—_Manganese_: Its Stimulant
        Action, 383.—The “_Insoluble Residue_” or Silicates,
        384.—_Soluble Silica and Alumina_, 384.—Analysis of Clay
        from Soil, 385.—Difference in Sand of Arid and Humid
        Regions. Table, 386.—Soluble Silica or Hydrous Silicates
        more Abundant in Arid than in Humid Soils, 388.—_Aluminic
        Hydrate._ Table, 389.—Retention of Soluble Silica in Alkali
        Soils, 391.—_Ferric Hydrate_, 392.—_Phosphoric Acid_,
        392.—Sulfuric Acid, 394.—_Potash_ and _Soda_, Retained
        more in Arid Soils, 394.—Arid Soils Rich in Potash,
        395.—_Humus_, Low in Arid Soils, but Rich in Nitrogen,
        396.—The Transition Region, 397.

                             CHAPTER XXI.
    SOILS OF ARID AND HUMID REGIONS CONTINUED, 398.—_Soils of the
        Tropics_, 398.—Humus in Tropical Soils, 399.—Investigations
        of Tropical Soils, 401.—_Soils of Samoa and Kamerun_,
        402.—Soils of the Samoan Islands, 403.—Soils of Kamerun,
        404.—_Soils of Madagascar_, 405.—_Soils of India_, 410.—The
        Indo-Gangetic Plain, 411.—The Brahmaputra Alluvium in
        Assam, 413.—Black Soils of Deccan, 414.—Red Soils of the
        Madras Region, 415.—Laterite Soils, 416.—_Influence of
        Aridity upon Civilization_, 417.—Preference of Ancient
        Civilizations for Arid Countries, 417.—Irrigation
        Necessitates Co-operation, 419.—High and Permanent
        Productiveness of Arid Soils Induces Permanence of Civil
        Organization, 419.

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

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