Classification tree 10:1. Oval branch nodes = splitting variables. Rectangular terminal nodes include classification as positive (Pos) or negative (Neg). Terminal nodes classified as positive and with more than 200 observations are framed in bold. Legend: A: improved grassland. B: coniferous woodland. C: semi-natural grass. D: broad-leaved/mixed woodland. E: mountain/heath/bog. F: arable and horticultural. G: built-up/gardens. H: standing open water. I: oceanic. J: coastal. K: combinations of freely draining foodplan soils. L: fen-peat soils. M: combination of acid and loamy soils. N: other types (salt marsh, sand dune, etc.).