Articles
ABSORPTION AND DISTRIBUTION OF ISOTOPICALLY LABELED NITROGEN IN THE HAZELNUT TREE FOLLOWING GROUND AND FOLIAR APPLICATIONS
Article number
556_65
Pages
437 – 444
Language
English
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.
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.
Publication
Authors
J.L. Olsen, E.I. Sanchez, T.L. Righetti
Keywords
mineral nutrition, Corylus avellana, foliar fertilizers, 15N
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