Although multi-factorial variance analysis for examined samples showed significant influence of variety and cultivation year on wheat hardness and mechanical resistance only, effect of cultivation region was also confirmed by variance analysis calculated separately for spring and winter wheat. Despite these strong variability in obtained values the cultivar order in homogenous Duncan's groups was constant (except cv. Begra and Jasna) what indicated a strong influence of genetic traits on mechanical resistance. It has been confirmed in results of discriminant analysis which showed good recognition of cultivars according to hardness independently of cultivar and cultivation region and year (Wilks' coefficient = 0.0547). Close correlation (R = 0.7275 at p Ł 0.05) between hardness determined in Single Kernel Characteristics System and mechanical resistance expressed by relative fracture force was established.