Field margins or buffer strips provide semi-natural habitat for feeding, shelter and breeding of wild plants and nesting for small animals and birds, and are considered a valuable space for biodiversity in agricultural landscapes.
Buffer strips can help prevent soil erosion and the transfer of agricultural pollutants from cropped areas to non-cropped areas.
Field margins and buffer strips can be included as Ecological Focus Areas (EFA) under the new Common Agricultural Policy (CAP) because they are not used for agricultural production.