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CO2–H2O leaf exchange in raspberry plants as affected by different red (R660)–far-red (FR)light ratio 30 days after transplanting: (a) net photosynthesis; (b) respiration rate; (c) stomatal conductance; (d) transpiration rate. Means ± standard error (SE); means followed by the same letter were not different at p ≤ 0.05. Treatment 1—0% R660 + 100% FR; Treatment 2—30% R660 + 70% FR; Treatment 3—70% R660 + 30% FR; Treatment 4—100% R660 + 0% FR.
