CAD.Placaquods

Key to Great Groups 

CAD. Other Aquods that have a placic horizon within 100 cm of the mineral soil surface in 50 percent or more of each pedon. Placaquods, p. 704 

CAD. These are the Aquods that have an involute placic horizon. The horizons above the placic horizon have low-contrast mottles that are probably caused by organic matter. Placaquods are known to occur only in areas of perhumid oceanic climates. Many have, or used to have, sphagnum and heath vegetation. 

Definition 

Placaquods are the Aquods that:

1. Have a placic horizon within 100 cm of the mineral soil surface in 50 percent or more of each pedon;

2. Have 0.10 percent or more iron (by ammonium oxalate) in 75 percent or more of the spodic horizon;

3. Do not have a cryic temperature regime; and

4. Do not have a fragipan with its upper boundary within 100 cm of the mineral soil surface. 

Key to Subgroups 

CADA. Placaquods that have andic soil properties throughout horizons that have a total thickness of 25 cm or more within 75 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower. Andic Placaquods 

CADB. Other Placaquods. Typic Placaquods 

Definition of Typic Placaquods 

Typic Placaquods are the Placaquods that do not have andic soil properties throughout horizons that have a total thickness of 25 cm or more within 75 cm either of the mineral soil surface or of the top of an organic layer with andic soil properties, whichever is shallower.

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