01946naa a2200289 a 450000100080000000500110000800800410001910000180006024500920007826000090017030000120017950001400019152011230033165000150145465000090146965000100147865000100148865000160149865000090151465300220152365300140154565300090155965300160156865300210158470000110160577300400161616448871997-07-10       1997    bl uuuu     u00u1 u    #d1 aCOELHO, E. F.  aSemi-analytical model for soil water distribution in the wetted volumewith plant uptake  c1997  ap.40-45  aIn: WORKSHOP ON SPECIAL TOPICS ABOUT SOIL PHYSICS AND CROP MODELING AND SIMULATION, 1997, Piracicaba, SP. Anais... Jaguariuna, SP: 1997  aAdvances in drip irrigation management rely on knowledge of the distribution and dynamics of soil water within the wetted soil volume. Part of the information can be obtained from numerical or analytical models for water flow from point or lime sources. However, a more complete picture of soil water dynamics in cropped fields requires explicit consideration of plant water extraction patterns. In this study we propose to combine an analytical solution for transient flow from cyclic point sources representing drippers with a parametric model for uptake by plant roots. A point apppppproximation is proposed (for monitoring purposes) based on a localized water balance which considers changes in water content due to transient flow from the dripper coupled with plantuptake only from the soil volume under consideration. Comparisons with grenhouse measurements show very good agreement with the localized approximation for two-day irrigation intervals. The method offers reasonable mean to describe soil water dynamics within wetted soil volumes under cropped conditions for various irrigation management scenarios.  airrigation  asoil  awater  aÁgua  aIrrigação  aSolo  aAnalytical models  aCongresso  aDrip  aGotejamento  aModelo analitico1 aOR, D.  tJaguariuna, SP: EMBRAPA-CNPMA, 1997