@INBOOK {LAL:1979a, title = {Towards optimizing soil physical characteristics for sustained production from soils in the tropics}, author = {Lal, R. }, editor = {Lal, R. and Greenland, D. J}, year = {1979}, type = {Soil Physical Properties and Crop Production in the Tropics edited by R. Lal and D.J Greenland}, pages = {529--532}, publisher = {J. Wiley and Sons}, address = {U.K}, }