1. Soil Conservation Engineering Laboratory, Environmental Engineering Graduate Course, Rural Federal of Pernambuco University (UFRPE), Recife, Brazil
2. Agronomy Department, Agrest Federal University (UFAPE), Garanhuns, Brazil
3. Agronomy Department, Instituto Federal de Pernambuco, Recife, Brazil
4. Agronomy Department, Federal Institute of Sciences and Education of Ceara State, Crato, Brazil
5. Academic Unit of Serra Talhada, Rural Federal of Pernambuco University (UFRPE), Serra Talhada, Brazil