Vol. 70 No: 2

Title:
Effects of Irrigation and Nitrogen Fertilization on the Water Relations of Prunus Avium and ‘Colt’ (P. Avium L. × P.Pseudocerasus Lind.) in the Nursery, and Residual Effects After Outplanting

Authors:
K.H. HIGGS, N.A. HIPPS and L.G. COLLARD

pp: 235-244

Abstract:
One year old Prunus avium seedlings and hardwood cuttings of ‘Colt’ were lined out in a nursery and given supplementary nitrogen fertilizer and/or irrigation. Irrigation increased leaf conductance (g_s) and leaf water potential (Ψ) in both genotypes but nitrogen did not affect these variables. In the following year, after outplanting, the residual effect of irrigation reduced g_s compared with plants that had received no previous irrigation. Leaf conductance was greater and Ψ was lower in Prunus avium as compared with ‘Colt’ each year. The greater g_s for P. avium led to greater water use per unit leaf area in this genotype. However, on a whole-plant basis, water use was approximately equivalent for each genotype due to a larger total leaf area on ‘Colt’. Water availability was the dominant factor in establishing early growth in these genotypes.

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