**Author details**

Renato de Mello Prado, Flávio José Rodrigues Cruz\* and Raphael Leone da Cruz Ferreira

\*Address all correspondence to: fjrc@bol.com.br

Department of Soils and Fertilizers, Faculty of Agricultural and Veterinary Sciences, Plant Nutrition Study Group-GenPlant, University State of São Paulo "Júlio de Mesquita Filho", São Paulo, Brazil
