ISHS Acta Horticulturae 594: International Symposium on Foliar Nutrition of Perennial Fruit Plants
THE INFLUENCE OF CHEMICAL. FORMS ON FOLIAR-APPLIED NITROGEN ABSORPTION FOR PEACH TREES |
| Authors: | S. Furuya, Y. Umemiya |
| Keywords: | nitrogen, foliar fertilization, chemical. forms, amino acid, Prunus percica |
| Abstract:
To determine the most effective chemical. form of foliar nitrogen (N) application for peach trees, we compared various kinds of foliar-applied N and determined N absorption into the leaf. In the first experiment, 15N labeled 50mM solutions were sprayed on to peach leaves in a greenhouse and the amounts of absorbed N were determined using a mass spectrometer. Absorption rates were the highest from urea and sodium nitrate, followed by ammonium chloride and four amino acids, namely L-alanine, L-glutamic acid, glycine and L-lysine, up to 7 days after foliar spraying. The total. amount of foliar-absorbed N showed a similar tendency to the foliar N absorption rate of 3-7 days after foliar spraying. In a subsequent experiment, 15 different amino acids were examined. The rate of foliar N absorption increased as the molecular weights of amino acids decreased. This relationship was not al.ways found and the N absorption rate from arginine and L-lysine was significantly higher compared with other amino acids having the same molecular weights. Based upon these results, urea appeared to be the most effective fertilizer for foliar N application to peach trees compared with other inorganic N sources or amino acids. | |
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