A drying model was developed to simulate the drying of hygroscopic porous material in a soil-residue-atmosphere system. An experimental plan for controlling the five climate condition variables and four material variables in 35 different experiments was set up. The results obtained were analyzed by multivariate modelling software. The calculations were made with partial least squares regression. Besides the initial moisture content and the residue loading rate, other variables in the drying model are: solar radiation, air temperature, relative humidity, average wind speed, average particle size of the residue, and the number of times the residue is turned. The predicted drying times calculated from the model are in good agreement with the experimental results.