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Acta Horticulturae
Zilkah, S., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Yeselson, Y., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
David, I., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Klein, I., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Young avocado (Persea americana Mill, cv. Pinkerton, rootstock Schmidt), grown in a coarse sandy soil, were exposed to 15N-labeled potassium nitrate and ammonium sulfate for 10 days during 4 phenological periods of autumn winter, spring and summer. Uptake efficiency (15N/15 N applied, %), N-enrichment (15N/N,%), and distribution of the absorbed l5N in tree organs were determined for each period. The uptake efficiency of N-nitrate was significantly higher than N-ammonium in each of the plant organs and during each of the seasonal periods. Nitrogen absorption efficiency in the whole tree was higher in the summer. During the various seasonal periods, both of the nitrogen forms were distributed among roots, trunk+branches and leaves organs, at similar manner. During autumn and winter a major rate of the absorbed nitrogen concentrated at roots and trunk+branches. At springtime the absorbed nitrogen was readily translocated and enriched the N-content of the leaves in a highest rate among the other seasons.
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Effect of seasonal phenological stage on uptake and distribution of 15N-labeled ammonium and nitrate in young avocado trees
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Zilkah, S., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Yeselson, Y., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
David, I., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Klein, I., Institute of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Effect of seasonal phenological stage on uptake and distribution of 15N-labeled ammonium and nitrate in young avocado trees
Young avocado (Persea americana Mill, cv. Pinkerton, rootstock Schmidt), grown in a coarse sandy soil, were exposed to 15N-labeled potassium nitrate and ammonium sulfate for 10 days during 4 phenological periods of autumn winter, spring and summer. Uptake efficiency (15N/15 N applied, %), N-enrichment (15N/N,%), and distribution of the absorbed l5N in tree organs were determined for each period. The uptake efficiency of N-nitrate was significantly higher than N-ammonium in each of the plant organs and during each of the seasonal periods. Nitrogen absorption efficiency in the whole tree was higher in the summer. During the various seasonal periods, both of the nitrogen forms were distributed among roots, trunk+branches and leaves organs, at similar manner. During autumn and winter a major rate of the absorbed nitrogen concentrated at roots and trunk+branches. At springtime the absorbed nitrogen was readily translocated and enriched the N-content of the leaves in a highest rate among the other seasons.
Scientific Publication
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