1. Department of Plant Production, Faculty of Agronomy, University of Concepcion, Avenida Vicente Mendez, 595, Chillán 3780000, Chile
2. Institute of Agricultural Research, Regional Research Center Quilamapu, Avenida Vicente Mendez, 515, Chillán 3780000, Chile
3. Plant Nutrition Laboratory, Department of Crop Sciences, Faculty of Agricultural Sciences, University of Talca, Avenida Lircay s/n, Talca 3460000, Chile