Agricultural land is graded using the Agricultural Land Classification (ALC) system. This system classifies land into five grades according to the extent to which physical or chemical characteristics impose long term limitations on the agricultural use of a site for food production. The grades are numbered 1 to 5, with Grade 3 divided into two Subgrades (3a and 3b).
Land within this grade has little to no limitations to agricultural use. This land can support a very wide range of agricultural and horticultural crops including top fruit, soft fruit salad crops and winter harvested vegetables. Yields are consistently high.
This land has minor limitations which affect crop yield, cultivations or harvesting. It can support a wide range of agricultural and horticultural crops but there can be some reduced flexibility on land within the grade, which causes difficulty in the production of more demanding crops e.g. winter harvested vegetables and arable root crops. This land is high yielding but may be lower or more variable than Grade 1.
This land has moderate limitations that affect the choice of crops to be grown, timing and type of cultivation, harvesting or yield. The yield of more demanding crops grown on this land is generally lower or more variable than on Grade 1 and 2.
This is land that is capable of consistently producing moderate to high yields of a narrow range of arable crops (e.g. cereals) or moderate yields of a wide range of crops (e.g. cereals, grass, oilseed rape, potatoes, sugar beet and less demanding horticultural crops).
This land is capable of producing moderate yields of a narrow range of crops (mainly cereals and grass) or lower yields of a wider range of crops, or high yields of grass (for grazing/harvesting).
Land included within this grade suffers severe limitations that significantly restrict the range and/or yield of crops to be grown. This land is mainly suited to grass with occasion arable crops – the yields of which are variable. In moist climates grass yields are likely to be moderate to high but there are often difficulties in utilisation. Very droughty arable land is also included in this land grade.
This land has severe limitations which restricts use to permanent pasture or rough grazing, except for occasional pioneer forage crops.
The ALC framework is used to classify agricultural land in England and Wales and referred to in National Planning Policy which protects ‘best and most versatile’ land – Grades 1, 2 and Subgrade 3a.
Land grades are determined by ALC survey carried out to current (post 1988) guidelines and in accordance with Natural England (Technical Information Note 049). For more information on the uses of Agricultural land classification (ALC) call 01509 670 570 to discuss your survey requirements with one of our Consultants.