Fig. 6.  Comparison of measured mean dry mass values per vine of grapes (A) or total stems (B) to predicted values estimated from multi‐year regression equations. (See Table 1 for more information concerning sampling calendar). G₀, G₅₀, G₁₀₀ and S represent ungrassed, half‐grassed, fully‐grassed and gravelly soil plots, respectively. Vertical and horizontal bars represent s.e.m. Solid and dashed lines represent the least square regression and the 1 : 1 line between measured and predicted values, respectively.