First Author:   Leonardo A. Rocha Federal Rural University of the Semi-Arid (UFERSA) leonardoandrocha@yahoo.com.br         Second Author: Denis Vieira Sarmento Adelmar Rosado College (FAR) dem.sarmento@gmail.com         Third Author: Carlos Alano S. Almeida Federal Rural University of the Semi-Arid (UFERSA) alano@ufersa.edu.br         Fourth Author: Napiê G.A. Silva Federal Rural University of the Semi-Arid (UFERSA) napiegalve@yahoo.com.br