Figure 5.

Regression plots of ψ_s estimation using the best PLS models developed from data of season 2015 at the sub replication unit scale (A,C,E) for (A) east (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.86; Prediction RMSE = 0.15 MPa), (C) west (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.78; Prediction RMSE = 0.19 MPa), and (E) east & west (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.81; Prediction RMSE = 0.17 MPa) sides of the canopy. At the field replication scale (B,D,F) for (B) east (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.90; Prediction RMSE = 0.14 MPa), (D) west (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.74; Prediction RMSE = 0.19 MPa), and (F) east & west (${\text{R}}_{\mathit{\text{p}}}^2$ = 0.84; Prediction RMSE = 0.17 MPa) sides of the canopy. (○) 10-fold cross validation; (♦) prediction. Solid line represents the regression line and dotted line refers to the 1:1 line. Prediction confidence bands are shown at a 95% level (dashed lines).