Figure 7. The relationship between leaf δ13C isotope (‰) and shoot growth (cm) for 2018 (square symbol) compared to measurements from 2019 (round symbol) (P <0.001, r = 0.924) for ‘Honeycrisp‘ apple trees on B.9, M.9, G.969, CG.4292, G.210, G.87, CG.5257, G.814, G.890 rootstocks. The lines indicate the adjusted linear regression for the combined data points.