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Botanically, soybean belongs to the order Rosaceae, family Leguminosae or Papillonaceae or Fa‐ baceae, subfamily Papilionoidae, the genus Glycine and the cultivar Glycine max. It is an annu‐ al plant that measures up to 1.5 m tall, with pubescent leaves and pods; the stems are erect and rigid. In its primary and secondary roots, are located a variable number of nodes. One of the characteristics of the root system development is its sensitivity to variations in the supply and distribution of inorganic nutrients in the soil. The root system has a main root which can reach a meter deep, with an average being between 40 and 50 centimeters [1].

Ivan Palomo1, Luis Guzman1, Elba Leiva1, Veronica Mujica2, Gilda Carrasco3, Nora Morgado4 and Daniel R. Gonzalez5 1Departamento de Bioquimica Clinica e Inmunologia, Facultad de Ciencias de la Salud, Universidad de Talca, , 2Escuela de Medicina, Universidad de Talca, 3Facultad de Ciencias Agrarias, Universidad de Talca, 4Universidad de Los Andes, Santiago, 5Departamento de Ciencias Basicas Biomedicas, Facultad de Ciencias de la Salud, Universidad de Talca, Talca, Chile