5). Mixed area
This referred the processing 2 different suitability class for sugarcane production which
could not be clearly separated. This was resulted from data limitation particularly soil data (soil associate which appears in the soil map). The area in this category, in other words, possessed 2
classes of suitability which were the combination of S2/S3 (Moderate and marginal suitability) on
other combinations. In Udon Thani, there were altogether 3 areas which fell into this catteryoccupying total area of 1,381.144 km
2
or 11.78% of the province.