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Field Indicators of Hydric Soils, Version 9.0, 2024
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List of Hydric Soil Indicators
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Figure 1. Soil Comparison.
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Figure 2.—Observe and Document the Soil.
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Figure 3.—Soil Color Guidance.
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Figure 4.—General Guidance for Using the Indicators.
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Figure 5.—Data Collection.
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Figure 6. Land Resource Regions and Major Land Resource Areas for the Conterminous United States.
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Figure 7.—Map of USDA land resource regions and major land resource areas in the nonconterminous United States.
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Figure 8.—Indicator A1, Histosol or Histel.
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Figure 9.—Indicators A2, Histic Epipedon and A3, Black Histic.
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Figure 10.—Indicator A4, Hydrogen Sulfide.
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Figure 11.—Indicator A5, Stratified Layers in sandy material.
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Figure 12.—Indicator A6, Organic Bodies.
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Figure 13.—Indicator A7, 5 cm Mucky Mineral.
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Figure 14.—Indicator A9, 1 cm Muck.
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Figure 15.—Indicator A11, Depleted Below Dark Surface.
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Figure 16.—Indicator A11, Depleted Below Dark Surface.
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Figure 17.—Indicator A12, Thick Dark Surface.
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Figure 18.—Indicator A13, Alaska Gleyed.
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Figure 19.—Indicator A14, Alaska Redox.
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Figure 20.——Indicator A15, Alaska Gleyed Pores.
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Figure 21.—Indicator A18, Iron Monosulfide in loamy/clayey material.
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Figure 22.— Gleyed colors.
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Figure 23.—Indicator S5, Sandy Redox.
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Figure 24.—Indicator S5, Sandy Redox.
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Figure 25.—Indicator S6, Stripped Matrix.
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Figure 26.—Indicator S7, Dark Surface.
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Figure 27.—Indicator S8, Polyvalue Below Surface.
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Figure 28.—Indicator S9, Thin Dark Surface.
