@INBOOK {LAL: 1986d,
title = {No-tillage and minimum tillage system to alleviate soil related constraint in the tropics},
author = {Lal, R. },
year = {1986},
type = {No-tillage and Minimum Tillage System edicted by M.A. Sprague and G.B. Triplett},
pages = {261--317},
}