Introduction

Acrisols:

Acidic soils with a layer of clay accumulation. Under the modified legend this class consists only of clays with low cation exchange capacity.

• Ferric Acrisols
• Gleyic Acrisols
• Haplic Acrisols, added to the revised legend.
• Humic Acrisols
• Orthic Acrisols, deleted in the revised legend.
• Plinthic Acrisols

Alisols:

A new soil class of formerly Acrisols with clays with high cation exchange capacity.

• Ferric Alisols
• Gleyic Alisols
• Haplic Alisols
• Humic Alisols
• Plinthic Alisols
• Stagnic Alisols

Andosols:

Dark soils formed from volcanic materials with little horizon development.

• Gelic Andosols, added to the revised legend.
• Gleyic Andosols, added to the revised legend.
• Haplic Andosols, added to the revised legend.
• Humic Andosols, deleted in the revised legend.
• Mollic Andosols
• Ochric Andosols, deleted in the revised legend.
• Umbric Andosols, added to the revised legend.
• Vitric Andosols

Anthrosols:

New class of soils formed by human activities.

• Aric Anthrosols
• Cumulic Anthrosols
• Fimic Anthrosols
• Urbic Anthrosols

Arenosols:

Sandy soils with little profile development.

• Albic Arenosols
• Calcaric Arenosols, added to the revised legend.
• Cambic Arenosols
• Ferralic Arenosols
• Gleyic Arenosols, added to the revised legend.
• Haplic Arenosols, added to the revised legend.
• Luvic Arenosols

Calcisols:

New class of soils with accumulation of calcium carbonate.

• Haplic Calcisols
• Luvic Calcisols
• Petric Calcisols

Cambisols:

Soil with slight profile development that is not dark in color.

• Calcaric Cambisols, added to the revised legend.
• Calcic Cambisols, deleted in the revised legend.
• Chromic Cambisols
• Dystric Cambisols
• Eutric Cambisols
• Ferralic Cambisols
• Gelic Cambisols
• Gleyic Cambisols
• Humic Cambisols
• Vertic Cambisols

Chernozems:

Dark soils rich in organic matter.

• Calcic Chernozems
• Gleyic Chernozems, added to the revised legend.
• Glossic Chernozems
• Haplic Chernozems
• Luvic Chernozems

Ferralsols:

Highly weathered soils rich in sesquioxide clays and with low cation exchange capacities.

• Acric Ferralsols
• Geric Ferralsols, added to the revised legend.
• Haplic Ferralsols, added to the revised legend.
• Humic Ferralsols
• Orthic Ferralsols, deleted in the revised legend.
• Plinthic Ferralsols
• Rhodic Ferralosols
• Xanthic Ferralosols

Fluvisols:

Alluvial and floodplain soils with little profile development.

• Calcaric Fluvisols
• Dystric Fluvisols
• Eutric Fluvisols
• Mollic Fluvisols, added to the revised legend.
• Salic Fluvisols, added to the revised legend.
• Thionic Fluvisols
• Umbric Fluvisols, added to the revised legend.

Gleysols:

Water saturated soils that are not salty.

• Andic Gleysols, added to the revised legend.
• Calcaric Gleysols
• Dystric Gleysols
• Eutric Gleysols
• Gelic Gleysols
• Humic Gleysols, deleted in the revised legend.
• Mollic Gleysols
• Plinthic Gleysols, deleted in the revised legend.
• Thionic Gleysols, added to the revised legend.
• Umbric Gleysols, added to the revised legend.

Greyzems:

Dark soils rich in organic matter.

• Gleyic Greyzems
• Haplic Greyzems, added to the revised legend.
• Orthic Greyzems, deleted in the revised legend.

Gypsisols:

New class of soils with an accumulation of calcium sulfate (gypsum).

• Calcic Gypsisols
• Haplic Gypsisols
• Luvic Gypsisols
• Petric Gypsisols

Histosols:

Soils very rich in organic matter (>14%).

• Dystric Histosols, deleted in the revised legend.
• Eutric Histosols, deleted in the revised legend.
• Fibric Histosols, added to the revised legend.
• Folic Histosols, added to the revised legend.
• Gelic Histosols
• Terric Histosols, added to the revised legend.
• Thionic Histosols, added to the revised legend.

Kastanozems:

Dark soils rich in organic matter.

• Calcic Kastanozems
• Gypsic Kastanozems, added to the revised legend.
• Haplic Kastanozems
• Luvic Kastanozems

Leptosols:

New class of soils that are shallow in depth and with weak profile development.

• Dystric Leptosols
• Eutric Leptosols
• Gelic Leptosols
• Lithic Leptosols
• Mollic Leptosols
• Rendzic Leptosols
• Umbric Leptosols

Lithosols:

Thin soils over rock. Removed from the revised legend.

• (no suborders)

Lixisols:

New soil class, formerly Luvisols, with clays with low cation exchange capacity.

• Albic Lixisols
• Ferric Lixisols
• Gleyic Lixisols
• Haplic Lixisols
• Plinthic Lixisols
• Stagnic Lixisols

Luvisols:

Soils with strong accumulation of clay in the B-horizon and not dark in color. Under the revised legend these soils have clays with high cation exchange capacity.

• Albic Luvisols
• Calcic Luvisols
• Chromic Luvisols
• Ferric Luvisols
• Gleyic Luvisols
• Haplic Luvisols, added to the revised legend.
• Orthic Luvisols, deleted in the revised legend.
• Plinthic Luvisols, deleted in the revised legend.
• Vertic Luvisols

Nitisols:

New class of soils with shiny surfaces on structural faces (peds) of the soil.

• Haplic Nitisols
• Humic Nitisols
• Rhodic Nitisols

Nitosols:

Acid soils with a very thick layer of clay accumulation. Removed from the revised legend.

• Dystric Nitosols
• Eutric Nitosols
• Humic Nitosols

Phaeozems:

Dark soils rich in organic matter.

• Calcaric Phaeozems
• Gleyic Phaeozems
• Haplic Phaeozems
• Luvic Phaeozems
• Stagnic Phaeozems, added to the revised legend.

Planosols:

Soils with a light-colored layer over a soil layer that restricts water drainage.

• Dystric Planosols
• Eutric Planosols
• Gelic Planosols
• Humic Planosols, deleted in the revised legend.
• Mollic Planosols
• Solodic Planosols, deleted in the revised legend.
• Umbric Planosols, added to the revised legend.

Plinthosols:

New class of mottled, clayey soils that irreversibly harden after repeated drying.

• Albic Plinthosols
• Dystric Plinthosols
• Eutric Plinthosols
• Humic Plinthosols

Podzols:

Soils with a strongly bleached layer and a layer of iron or aluminum cemented organic matter.

• Cambic Podzols, added to the revised legend.
• Carbic Podzols, added to the revised legend.
• Ferric Podzols
• Gleyic Podzols
• Haplic Podzols, added to the revised legend.
• Humic Podzols, deleted in the revised legend.
• Leptic Podzols, deleted in the revised legend.
• Orthic Podzols, deleted in the revised legend.
• Placic Podzols, deleted in the revised legend.

Podzoluvisols:

Soils similar to both Podzols and Luvisols.

• Dystric Podzoluvisols
• Eutric Podzoluvisols
• Gellic Podzoluvisols, added to the revised legend.
• Gleyic Podzoluvisols
• Stagnic Podzoluvisols, added to the revised legend.

Rankers:

Shallow, dark soils rich in organic matter and formed from siliceous material. Removed from the revised legend.

• (no suborders)

Regosols:

Surface layer of rocky material. Coarse texture Regosols have been incorporated in the Arenosols under the revised system.

• Calcaric Regosols
• Dystric Regosols
• Eutric Regosols
• Gelic Regosols
• Gypsic Regosols, added to the revised legend.
• Umbric Regosols, added to the revised legend.

Rendzinas:

Dark soils rich in organic matter over calcareous material. Removed from the revised legend.

• (no suborders)

Solonchaks:

Salty soil with little horizon development.

• Calcic Solonchaks, added to the revised legend.
• Gleyic Solonchaks
• Gypsic Solonchaks, added to the revised legend.
• Haplic Solonchaks, added to the revised legend.
• Mollic Solonchaks
• Orthic Solonchaks, deleted in the revised legend.
• Stagnic Solonchaks, added to the revised legend.
• Takyric Solonchaks, deleted in the revised legend.

Solonetz:

Salty soil with a high concentration of sodium.

• Calcic Solonetz, added to the revised legend.
• Gleyic Solonetz
• Gypsic Solonetz, added to the revised legend.
• Haplic Solonetz, added to the revised legend.
• Mollic Solonetz
• Orthic Solonetz, deleted in the revised legend.
• Stagnic Solonetz, added to the revised legend.

Vertisols:

Clayey soils that form deep (>50 cm), wide (>1 cm) cracks when dry.

• Calcic Vertisols, added to the revised legend.
• Chromic Vertisols, deleted in the revised legend.
• Dystric Vertisols, added to the revised legend.
• Eutric Vertisols, added to the revised legend.
• Gypsic Vertisols, added to the revised legend.
• Pellic Vertisols, deleted in the revised legend.

Xerosols:

aridic soils. Removed from the revised system.

• Calcic Xerosols
• Gypsic Xerosols
• Haplic Xerosols
• Luvic Xerosols

Yermosols:

aridic soils. Removed from the revised system. Yermic has been added to the management phases.

• Calcic Yermosols
• Gypsic Yermosols
• Haplic Yermosols
• Luvic Yermosols
• Takyric Yermosols