Fig. S1 Volumetric soil moisture (ls means ± 1 SE). Data were collected at three soil depths (20–50, 50–80 and 80–110 cm) in irrigated soil zones, with irrigation designed for 40 and 100% replacement of vine evapotranspiration (ETc) (left panels), and in unirrigated soil zones of the same plant (right panels), averaged over 3 yr (2003–05) (year × rootstock effect; P > 0.40). Significantly drier soil was maintained on the unirrigated side of the vine in the deficit irrigation (40% ETc; P < 0.0001) and full irrigation (100% ETc; P < 0.0001) treatments (means followed by different letters are significantly different, P < 0.05).

Fig. S2 Survivorship of roots in irrigated (a) and unirrigated (b) soils in the top 0–60 cm for grapevines of different potential growth rate at irrigation added twice weekly to replenish 100% of estimated evapotranspiration (100% ETc). Data represent roots born during the months of July–August for vines of high shoot vigor (HSV, rootstock 1103P, closed circles) and lower shoot vigor (LSV, rootstock 101–14 Mgt, open circles) over the years 2003–05. No significant differences between wet and dry sides (P > 0.43) or between rootstocks (P > 0.08) were observed. The shaded area indicates the period of lowest soil moisture (July–September).

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