Figure 5. The relationship between net CO2 assimilation (µmol CO2 m-2s-1) and shoot growth (cm) for 2018 (P <0.001, r = 0.923) 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 best-fit linear relationship for the combined data points.