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Proceedings of the International Plant Propagator's Society

Vol. 35

Title:
INFLUENCE OF EXOGENEOUS AUXIN APPLICATION ON THE MINERAL NUTRIENT STATUS OF ‘CONVEXA’ HOLLY CUTTINGS DURING INTERMITTENT MIST PROPAGATION

Authors:
Frank A. Blazich, Robert D. Wright and Henry E. Schaffer

pp: 694-700

Abstract:
Hardwood stem cuttings of Ilex crenata ‘Convexa’ Thunb., treated with and without indolebutyric acid (IBA), were inserted into a perlite rooting medium and misted with deionized water during intermittent mist propagation in a controlled-environment chamber. Initially, and at weekly intervals for 6 weeks, leaves, upper stems (portion of stem above rooting medium) and lower stems (portion of stem in rooting medium) were analyzed for N, P, K, Ca, and Mg. At the conclusion of the study, both nontreated and IBA-treated cuttings showed a slight increase in dry weight with detectable but slight leaching of N and K and no detectable leaching of P, Ca, and Mg. Mineral nutrient mobilization to the lower stem was not detected during root initiation for nontreated and IBA-treated cuttings. Following root initiation and later budbreak on the upper stem, N, P, K, Ca, and Mg were all mobilized from the leaves of nontreated and IBA-treated cuttings to the upper stem, whereas only N, P, and K were mobilized to the lower stem of IBA-treated cuttings. For nontreated cuttings, all nutrients were mobilized from the lower stem to the upper stem, while for IBA-treated cuttings only Ca and Mg were mobilized from the lower stem to the upper stem. Root development, as influenced by IBA treatment and budbreak on the upper stem, had a strong influence on mineral nutrient mobilization.

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