Uptake and translocation of nitrogen in satsuma mandarin trees

With the purpose of analyzing uptake and translocation of fertilizer N in satsuma mandarin, 15N-labeled ammonium sulfate was applied as a fertilizer to experimental trees of about 20 years old in the following four seasons each: i.e. before harvest in autumn, after harvest in autumn, spring and summ...

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Bibliographic Details
Published in:JARQ. Japan agricultural research quarterly 1991-10, Vol.25 (2), p.125-132
Main Authors: Iwakiri, T. (Saga-ken. Fruit Tree Experiment Station, Ogi (Japan)), Shibuya, M, Koyama, T
Format: Article
Language:English
Subjects:
ABSORCION DE SUBSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
Absorption. Translocation of ions and substances. Permeability
Agronomy. Soil science and plant productions
AZOTE
Biological and medical sciences
CITRUS
Economic plant physiology
Fundamental and applied biological sciences. Psychology
ISOTOPE
ISOTOPOS
NITROGENO
Nutrition. Photosynthesis. Respiration. Metabolism
SULFATE D'AMMONIUM
SULFATO DE AMONIO
TECHNIQUE DES TRACEURS
TECNICAS DE TRAZADORES
TRANSPORT DES SUBSTANCES NUTRITIVES
TRANSPORTE DE NUTRIENTES
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Summary:With the purpose of analyzing uptake and translocation of fertilizer N in satsuma mandarin, 15N-labeled ammonium sulfate was applied as a fertilizer to experimental trees of about 20 years old in the following four seasons each: i.e. before harvest in autumn, after harvest in autumn, spring and summer. The translocation of 15N to leaves took place within the year of application when it was supplied before harvest in autumn, whereas 15N applied before harvest in the autumnal season was translocated only at almost the same time with that applied in the following spring season. The translocation rate of applied 15N to leaf organs in the tree plants reached a peak about 25 days after fertilization when the soil temperature was about 10 C or higher. The greatest contribution of applied 15N to fruit organs was observed under the summer N-fertilization. However, the summer application distributed more 15N to peel tissue than to flesh in the late autumn. These results were effectively incorporated in the improvement of cultivation practices of satsuma mandarin in various parts of Japan, particularly in rationalizing fertilizer application in production centers
ISSN:0021-3551