01291naa a2200229 a 450000100080000000500110000800800410001902000180006010000190007824500530009726000090015030000130015952006730017265000160084565000180086165000120087965000110089165000090090265300130091165300120092477301250093613275832002-11-22       1977    bl uuuu     u00u1 u    #d  a0 471 99473 11 aGARDNER, W. R.  aWater entry and movement in relation to erosion.  c1977  ap. 25-31  aSurface water flow is the culprit in soil erosion, but it is subsurface flow which, along with the precipitation, governs the surface flow process. The capacity of the soil mantle to absorb water is finite, and whenever the rainfall rate exceeds the infiltration capacity the result is surface runoff. When the rainfall rate is less than the infiltration capacity, gravity and the affinity of soil particles for water molecules combine to direct the impinging water droplets into the subsurface flow system as rapidly as they strike the surface. It is in the nature of the infiltration process that the rate of precipitation or the infiltration capacity of the soil...  aAgricultura  aConservação  aErosão  aManejo  aSolo  aControle  aTropico  tIn: GREENLAND, D.J.; LAL, R. Soil conservation and management in the humid tropics. Chichester: John Wiley & Sons, 1977.