TY  - BOOK
AU  - Porto,E.R.
ED  - Arizona Univ. (USA)
TI  - An economic evaluation of selected soil and Water management technologies for rainfed agriculture: a study case in the arid zones of Brazil
PY  - 1988///.
CY  - Arizona (USA): 
KW  - Sistema de Cultivo
KW  - Zona Semi-arida
ER  -