@ARTICLE {GICHURU:1988,
title = {Phosphate rock fertilization in tilled and no-till low-input systems in the humid tropics},
author = {Gichuru, M. and Sanchez, P. },
journal = {Agronomy Journal},
year = {1988},
volume = {80},
pages = {943--947},
issn = {0002-1962},
}