ISHS Acta Horticulturae 146: International Workshop on Controlling Vigor in Fruit Trees
CROPPING EFFICIENCY, DRY MATTER AND NITROGEN DISTRIBUTION IN MATURE GENETIC DWARF AND STANDARD PEACH TREES |
| Authors: | T.M. DeJong, J.F. Doyle |
| Abstract:
Mature, six-year-old standard and genetic dwarf peach trees [Prunus persica (L.) Batsch] were harvested and divided into their above-ground components to compare the cropping efficiency, dry matter and reduced nitrogen distribution characteristics of each phenotype. In addition to the expected differences in absolute amounts of total above-ground dry weight, reduced nitrogen content, and leaf area, there were significant differences in the way these components were distributed within the trees. The genetic dwarfs allocated a larger percentage of their above-ground dry matter to leaves, fine branches, and fruit and a smaller percentage to the larger wood component than did the standard trees. The compact, genetic dwarf tree canopies had larger amounts of leaf area and leaf nitrogen per unit of canopy volume but lower leaf nitrogen per unit of leaf area than standard trees. There were no significant differences between the two phenotypes with respect to leaf area per unit of ground area, fruit dry weight per unit leaf area, fruit dry weight per unit of leaf nitrogen, or fruit dry weight per unit of ground area. | |
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