The combined method consists of a triple combination of the main drying techniques. Thus, in first stage the samples were dried in hot air convection at 60 C, 180 min, followed by hot air ventilation at 40 C simultaneous with microwave at different powers (105W – 30 min, 210W – 15 min and 315W – 9 min). From the starting of the drying the change in the sample weight was recorded at the time intervals of 30 min for hot air drying and 3 min for microwave drying. The drying method labels for these set are (60 C/C40 C + MW105 W), (60 C/C40 C + MW1210 W), (60 C/C40 C + MW315 W).