Table 2 Intercept and slope values of the linear regression model (LM) of Ψpd to Ψsoil for 30 wine grape cultivars and 2 years of data; all slopes are significantly different (p < 0.001), and the p values of the intercepts are reported. The R2 of multiple linear regression models (MLM) for Ψpd as a function of Ψsoil and vapor pressure deficit (VPD) is shown for all cultivars; the effect of Ψsoil is significant for all cultivars (p < 0.001) and the p values for the VPD effect are listed. The r2 for the LM of the Ψsoil to Ψpd difference (Ψpd − Ψsoil) with VPD is reported with the p value for VPD as the independent variable
From: Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture
LM Ψpd and Ψsoil | MLM VPD and Ψsoil | LM VPD and (Ψpd − Ψsoil) | |||||
|---|---|---|---|---|---|---|---|
intercept | slope | p (intercept) | R2 | p (VPD) | r2 | p (VPD) | |
Aligoté | -0.12 | 1.08 | < 0.001 | 0.62 | 0.77 | 0.01 | 0.60 |
Albariño | -0.13 | 0.90 | < 0.001 | 0.75 | 0.01 | 0.10 | 0.04 |
Auxerrois | -0.16 | 0.91 | < 0.001 | 0.79 | 0.72 | 0.00 | 0.90 |
Barbera | -0.08 | 1.38 | 0.00 | 0.64 | 0.10 | 0.12 | 0.03 |
Cabernet franc | -0.14 | 1.11 | < 0.001 | 0.70 | 0.55 | 0.02 | 0.34 |
Cabernet Sauvignon | -0.11 | 1.22 | < 0.001 | 0.77 | 0.00 | 0.26 | < 0.001 |
Chardonnay | -0.14 | 0.57 | < 0.001 | 0.81 | 0.00 | 0.01 | 0.62 |
Chenin blanc | -0.18 | 0.47 | < 0.001 | 0.36 | 0.12 | 0.00 | 1.00 |
Durif | -0.05 | 1.85 | 0.14 | 0.71 | 0.75 | 0.08 | 0.07 |
Gewürztraminer | -0.09 | 0.91 | < 0.001 | 0.74 | 0.94 | 0.00 | 0.70 |
Green Veltliner | -0.07 | 1.07 | 0.01 | 0.78 | 0.57 | 0.02 | 0.39 |
Grenache | -0.06 | 1.04 | 0.01 | 0.78 | 0.07 | 0.09 | 0.07 |
Lemberger | -0.15 | 1.26 | 0.00 | 0.57 | 0.03 | 0.15 | 0.01 |
Malbec | -0.08 | 0.88 | < 0.001 | 0.68 | 0.66 | 0.02 | 0.39 |
Melon | -0.05 | 1.59 | 0.11 | 0.77 | 0.04 | 0.19 | 0.01 |
Merlot | -0.11 | 1.00 | < 0.001 | 0.67 | 0.59 | 0.01 | 0.62 |
Mourvèdre | -0.05 | 1.41 | 0.08 | 0.67 | 0.02 | 0.21 | 0.00 |
Muscat blanc | -0.11 | 0.37 | < 0.001 | 0.57 | 0.37 | 0.11 | 0.04 |
Nebbiolo | -0.12 | 1.04 | < 0.001 | 0.71 | 0.21 | 0.04 | 0.20 |
Petit Verdot | -0.12 | 0.92 | 0.00 | 0.52 | 0.45 | 0.01 | 0.66 |
Pinot blanc | -0.13 | 0.99 | < 0.001 | 0.62 | 0.86 | 0.00 | 0.85 |
Pinot gris | -0.12 | 1.08 | 0.00 | 0.49 | 0.51 | 0.00 | 0.69 |
Pinot noir | -0.13 | 0.85 | < 0.001 | 0.57 | 0.31 | 0.00 | 0.74 |
Riesling | -0.08 | 1.15 | 0.02 | 0.65 | 0.99 | 0.00 | 0.71 |
Sangiovese | -0.05 | 1.69 | 0.01 | 0.85 | 0.01 | 0.30 | < 0.001 |
Sauvignon blanc | -0.10 | 0.72 | < 0.001 | 0.54 | 0.59 | 0.05 | 0.16 |
Sémillon | -0.12 | 1.19 | 0.00 | 0.57 | 0.90 | 0.00 | 0.76 |
Tempranillo | -0.13 | 1.01 | < 0.001 | 0.75 | 0.00 | 0.22 | 0.00 |
Viognier | -0.06 | 0.96 | < 0.001 | 0.81 | 0.54 | 0.00 | 0.70 |
Zinfandel | -0.08 | 1.78 | 0.03 | 0.61 | 0.27 | 0.12 | 0.03 |