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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 XIX.
    ANALYSIS OF VIRGIN SOILS BY EXTRACTION WITH STRONG ACIDS AND
        ITS INTERPRETATION, 340.—Loughridge’s Investigation on
        Strength of Acid and Time of Digestion, 340.—_Writer’s
        Method_, 342.—Virgin Soils with High Plant-food Percentages
        are always Productive. Table, 343.—Discussion of Table,
        343.—Low Plant-food Percentages not always Indication of
        Sterility, 346.—What are “Adequate” Percentages of Potash,
        Lime, Phosphoric Acid and Nitrogen, 347.—Soil-Dilution
        Experiments, 347.—Table of Compositions, 350.—Figures of
        Plants and their Root-Development, 351.—Limitation of Root
        Action, 351.—Lowest Limits of Plant-food Percentages and
        Productiveness Found in Virgin Soils, 353.— _Limits of
        Adequacy of the Several Plant-food Percentages in Virgin
        Soils_, 353.—Lime a Dominant Factor in Interpretation,
        353.—Potash, 354.—Phosphoric Acid, 355.—Action of Lime and
        Ferric Oxid, 355.—Table of Hawaiian Ferruginous Soils,
        356.—Unavailability of Ferric Phosphate, 356.—Nitrogen,
        357.—Nitrification of the Organic Matter of the Soil,
        358.—Analysis of Soil from the Ten-Acre Tract at Chino,
        Cal., 358.—Experiments and Results; Matière Noire the
        Only Guide, 360.—What are Adequate Nitrogen Percentages
        in the Humus? 360.—Table of Humus and Nitrogen-Content
        of Californian and Hawaiian Soils, 361.—Confirmatory
        Experiment. Figure, 362.—Data for Nitrogen-Adequacy. Table,
        363.—_Influence of Lime upon Soil Fertility_, 365.—“A
        Lime Country is a Rich Country,” 365.—Effects of High
        Lime-Content in Soils, 365.—Table of Soils showing Low
        Phosphoric Acid with High and Low Lime-Content, 366.—What
        are Adequate Lime-percentages? Differ for Light and Heavy
        Soils, 367.—Table Showing Need of High Lime Percentages
        in Heavy Clay Soils, 368.—European Standards for Land
        Estimates, 369.—Maercker’s Table, 369.

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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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