Alfisols of the Semi-Arid Tropics: Problems and PotentialsS PWaniauthorARamakrishnaauthorAlfisols are the third most important soil order in the world, covering 13.1% of the world area. In the semi-arid tropics, Alfisols cover a much larger area of potentially arable and grazable lands than Vertisols, which have until now received far more attention from ICRISAT researchers. About 62% of the world’s Alfisols are located in West Africa and IndiaWatershed ManagementAgriculture-Farming, Production, Technology, Economics2002International Crops Research Institute for the Semi-Arid Tropics Article