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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Abstract

JOSE, Jackson Freitas Brilhante de São et al. Boron mobility in eucalyptus clones. Rev. Bras. Ciênc. Solo [online]. 2009, vol.33, n.6, pp.1733-1744. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832009000600022.

Understanding the magnitude of B mobility in eucalyptus may help to select clones that are more efficient for B use and to design new practices of B fertilization. This study consisted of five experiments with three eucalyptus clones (129, 57 and 58) where the response to and mobility of B were evaluated. Results indicated that clone 129 was less sensitive to B deficiency than clones 68 and 57, apparently due to its ability to translocate B previously absorbed via root systems to younger tissues when B in solution became limiting. Translocation also occurred when B was applied as boric acid only once to a single mature leaf, resulting in higher B concentration in roots, stems and younger leaves. The growth of B-deficient plants was also recovere by a single foliar application of B to a mature leaf. This mobility was greater, when foliar-applied B was supplied in complexed (boric acid + manitol) than in non-complexed form (boric acid alone). When the root system of clone 129 was split in two solution compartments, B supplied to one root compartment was translocated to the shoot and back to the roots in the other compartment, improving the B status and growth. Thus, it appears that B is relatively mobile in eucalyptus, especially in clone 129, and its higher mobility could be due to the presence of an organic compound such as manitol, able to complex B.

Keywords : micronutrient; forest nutrition; translocation; polyol.

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