 Criteria for defining and delineating these lands are determined by the appropriate state or local agencies in cooperation with USDA.The significant difference is that although the criteria are not appropriate outside the state or local area, that these lands approach the productivity of lands in their area which meet criteria for prime farmland and unique farmland.A universal method for the demarcation of Prime Farmland (PF) soils that considers both science and policy is highly necessary, as when PF soils occupy < 60% of an area their preservation is hard.