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Distribution of Foliar-applied Boron Measured by Spark-source Mass Spectrometry and Laser-probe Mass Spectrography

¹ Laboratoire de Biologie Végétale, Département de Recherche Fondamentale, Centre d'Etudes Nucléaires, 85 X—38041 Grenoble Cédex, France, ² Section d'Etudes et d'Analyses Physico-Chimiques, Département de Chimie Appliquée, Centre d'Etudes Nucléaires, 85 X—38041 Grenoble Cédex, France

The distribution of foliar-applied boron ([¹⁰B]boric acid) in radish (Raphanus sativus L.) was studied using for analysis of the stable isotopes a technique allowing a high sensitivity: spark-source mass spectrometry. Boron was recovered in the nontreated aerial parts and in the roots; however, the greatest fraction was in the treated leaf. It was possible with a laser-probe mass spectrograph to show that boron was not superficially located in the treated area but was present in tissues at all levels of depth considered.