Abstract:
Evaluation and sensitivity analysis of a soil-water---
atmosphere-plant simulation model, SWATRE, developed by
Feddes et al (1978) in The Netherlands was conducted.
The evaluation was performed with the observed data
obtained by Cuenca (1978) for three different irrigation
levels in UC82 variety tomato fields in Davis,
California. SWATHE requires about one hundred different
input data from the soil-water-atmosphere-plant (SWAP)
system. Since the specific required data were not
available in every case, unique approaches were applied
to define a root sink function, soil characteristic
curve, rooting depth, soil hydraulic conductivity, and
saturated soil moisture content. The basic water balance
equation of SWATRE is a function of the differential soil
Ti tie: Evaluation and Sensitivity of a
Soil-Water-Atmosphere-P1ant Simulation Model
moisture capacity, hydraulic conductivity, and root sink
function (Feddes et al., 1978). Additionally potential
evapotranspiration affects the simulation of the SWAP
system significantly. The importance of these variables
was investigated by applying sensitivity analysis.
