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- Reclamation's systematic placing of lands into classes based on their suitability for sustained irrigated farming. Land classes are defined by productivity, with Class 1 being the most productive. For other classes, the equivalent acreage to Class 1 for the same productivity is defined (Class 1 equivalency). For example, (the productivity of) X acres of Class 2 land is equal to (the productivity of) 1 acre of Class 1 land.
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- Acre (ac), Arable land, Deed covenant, Excess land, Exempt land, Fallow, Irrigable land, Irrigation, Land ownership, Land retirement, Marginal land, Multiple use, Public land order, Saline sodic land, Temporary irrigation service land