Soil Map Unit Description from the Soil Survey of Rhode Island

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Tb—Tisbury silt loam.

This nearly level, moderately well drained soil is in depressions in terraces and outwash plains. Slopes range from 0 to 3 percent but are dominantly less than 2 percent. Areas are irregular in shape and range mostly from 5 to 50 acres.

Typically the surface layer is dark brown silt loam about 8 inches thick. The subsoil is 20 inches thick. It is yellowish brown silt loam that is mottled in the lower part. The substratum is pale brown, mottled very gravelly sand to a depth of 60 inches or more.

Included with this soil in mapping are small areas of well drained Enfield and Bridgehampton soils and poorly drained Raypol soils. Included areas make up about 10 percent of this map unit.

The permeability of this soil is moderate in the surface layer and subsoil and rapid or very rapid in the substratum. Available water capacity is moderate, and runoff is slow. This soil has a seasonal high water table at a depth of about 20 inches from late fall through midspr ing. The soil is very strongly acid through medium acid.

This soil is suitable for community development but is limited by the seasonal high water table. Onsite sewage disposal systems need special design and installation to prevent pollution of ground water. If suitable outlets are available, subsurface drains can be used to help prevent wet basements. Roads and streets need careful design to prevent frost heaving.

This soil is suited to trees, but most areas are used for farming or openland wildlife habitat.

The soil is suited to cultivated crops. It dries out and warms slowly in the spring, limiting early planting and machinery operation, and artificial drainage is needed. The use of cover crops and the return of crop residue to the soil help to maintain tilth and organic mailer content.

This soil is suited to woodland wildlife habitat and openland wildlife habitat. It is poorly suited to wetland wildlife habitat because of a lack of adequate water in the summer. Capability subclass 1 woodland group 3o.

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