Alfisols oi Semi-Arid Tropics (SAT) are often chiiractcriscd as structurally
unstable (EL-Swaify et 31.. 1905). Under the impact of raindrops the
structural instability leads to formation of a seal on the surface. The surface
seals rcducc infiltration and increase runoff (Moore, 1981 1. As a result,
plant-available water in the profile gets reduced. In most of the SAT Alfisols
crop yields arc constrained by the plant-available water