Abstract
Abstract ‘York Imperial’ apple trees on EM 26 rootstock were grown in large, outdoor sand cultures for 3 years. All combinations of N at 2, 4, or 8 me/1 as all NO3 or as 3/4NH4 - 1/4 NO3; Ca at 1, 8 or 16 me/1; and B at 0.05 or 0.5 ppm were supplied in solution, with other nutrients in normal supply. Levels of N and Ca and their interactions affected growth under NO3 nutrition. Growth was greatly reduced under NH4 nutrition, but was little affected by levels of N and Ca. Leaf tissues were analysed for N, P, K, Ca, Mg, Al, B, Cu, Fe, Mn, and Zn. The average, 3-year over-all effect of NH4 nutrition was to increase leaf concentration of all elements except K, Al, and Mn. Source of N altered the main effects and interactions between levels of N and Ca. B had little effect on concentration of other elements in the leaves.
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