Model of the pression transfer apply on an alfisol from Tabuleiros Costeiros

Abstract

The cohesive subsurface horizon of the Arfisol of Tabuleiros Costeiros, reduces the effective depth of these soils, compromising the yield and longevity of the perennial crops. This pedogenetic limitation can be potentiated when the pressure applied on the surface of the Ap horizon, during the traffic of agricultural machinery is transmitted to deeper horizons, AB or Bt, at higher levels the load-bearing capacity of these layers. The objective of this research was to mathematically model the transfer of pressures applied to the surface of the Ap horizon of an Alfisol for subsurface layers, relating the pressure applied to the soil profile moisture. With the experiment developed in the Laboratory of Soils and Plant Nutrition of Embrapa Tabuleiros Costeiros, it was concluded that moisture has a damping effect on the pressure transmitted from upper layers to subsurface. The pressure transmitted to the subsurface shows an exponential function with negative correlation as a function of depth, independent of the applied pressure on the surface. The increase in the contact area for the application of pressures on the soil surface, attenuates the transmission of pressure to lower layers when compared to the same pressure applied in smaller areas