ISHS Acta Horticulturae 556: V International Congress on Hazelnut
ABSORPTION AND DISTRIBUTION OF ISOTOPICALLY LABELED NITROGEN IN THE HAZELNUT TREE FOLLOWING GROUND AND FOLIAR APPLICATIONS |
| Authors: | J.L. Olsen, E.I. Sanchez, T.L. Righetti |
| Keywords: | mineral nutrition, Corylus avellana, foliar fertilizers, 15N |
| Abstract:
Isotopically labeled nitrogen (N) was used in on-farm research trials to evaluate the uptake, storage, and remobilization of N in ‘Barcelona’ hazelnut trees for both ground and foliar N applications at various timings. In experiments where uptake efficiency was evaluated, 28% of the applied N was recovered. Although hazelnuts have a growth cycle that is very different from other tree fruits, our data generally confirms observations in other tree species. Fertilizer N provided only a small portion of the N present in new growth. Hazelnut trees rely heavily on stored N reserves to fuel leaf and nut production. Tree reserves are an especially important N source for new growth in early spring. June applications were less efficient than March applications when N was ground-applied. Foliar applications in July or after harvest differ in how the N is partitioned among tissues. | |
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