Trace elements in orchards. Part 2: Interactions between soil- and foliar-applied boron, zinc, copper and manganese

afrique du sud analyse de tissus análisis de tejidos aplicación de abonos aplicación foliar application foliaire bore boro boron chemical composition cinc cobre composición quimica composition chimique copper cuivre fertilisation fertilizer application feuille foliar application hojas huerto frutal leaves malus manganese manganeso manganèse orchards prunus soil sol south africa sudáfrica suelo tissue analysis verger zinc