This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001. We would like to thank CAPES for the financial support and to the producers Alessandra Bellas Romariz de Macedo and Cláudio Massato Matsuoka for the kindness and patience in solving all doubts about the Brazilian small farming. We also thank the Association of Citriculturists and Rural Producers of Tanguá (ACIPTA).