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Important Farmlands of North Carolina
This listing cancels and supercedes all prior listings including
prime farmland lists in soil surveys that were published prior to 1998.
Introduction
Three categories of important farmlands are recognized in North
Carolina-prime, unique, and statewide. Criteria used for prime and unique
farmlands were published January 31, 1978 in the Federal Register and amended in
June 17, 1994. These criteria are also in in General Manual, Title 310-Land Use,
section 403.3 and Section 622 of the Natural Resources Conservation Service
(NRCS) National Soil Survey Handbook (Title 430). Criteria for farmland of
statewide importance were developed in 1988 by the North Carolina NRCS State
Soils Staff in consultation with soil survey cooperators, resource
conservationists, and key soil survey customers.
Prime Farmland
In general, all soils with slopes between 0 and 8 percent that are in
capability classes I and II, and some that are in capability class III meet the
requirements for prime farmland. Soils that flood an somewhat poorly drained,
poorly drained, and very poorly drained soils meet the requirements for prime
farmland under certain conditions if the following requirements are met:
- The soils are drained and the drainage system is adequate to maintain the
water table at a sufficient depth during the growing season to allow
cultivated crops common to the area to be grown.
- The soils are protected or not frequently flooded during the growing
season.
Excluded from prime farmland are soils that fall into the following
categories:
- Cobbly, stony, or bouldery soils.
- Soils having adverse physical or chemical properties that restrict crop
yields such as shallowness to bedrock, fragipans, low available water
capacity, etc.
- Wet soils (somewhat poorly drained, poorly drained, and very poorly
drained) that are in clayey families.
- Severely eroded phases.
- Sandy phases of soils in a coarse-loamy family.
- Soils with slopes that exceed 8 percent.
Unique Farmland
In general, soils that have a special set of properties that are unique for
producing certain high-value crops meet the requirements for unique farmland. In
North Carolina soils on which blueberries are produced meet these requirements.
In this listing drained phases of the Leon, Lynn and Murville series are
examples of soils in this category.
Farmland of Statewide Importance
In general, soils that do not quite meet the requirements for prime farmland
fall into this category. This could be due to steepness of slope, permeability,
susceptibility to erosion, low available water capacity, or some other soil
property.
The following criteria were selected to help define farmland of statewide
importance in North Carolina:
- Slopes shall not exceed 15 percent.
- Stony, very stony, extremely stony, very cobbly, and bouldery phases are
excluded.
- Severely eroded phases are excluded.
- Wet soils that have very slow permeability ( < 0.06 in/hr ) are
excluded.
- Somewhat poorly drained, poorly drained, and very poorly drained soils
that are not drained are excluded.
- Soil that are frequently flooded during the growing season are excluded.
- Soils that are droughty, 3 inches or less available water capacity to a
limiting layer or 40 inch depth, are excluded from this category.
- Rocky phases or soils that have rock outcrop in the map unit name are
excluded from this category.
Legend for Abbreviations
- P1 All areas are prime farmland.
- P2 Only drained areas are prime farmland.
- P3 Only areas protected or not frequently flooded during the growing
season are prime farmland
- P5 Only drained areas that are either protected from flooding or not
frequently flooded during the growing season are prime farmland.
- S1 All areas are farmland of statewide importance.
- S2 Only drained areas are farmland of statewide importance.
- U2 Only drained areas are unique farmland.
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