EN
To determine mechanical properties of sugar beet root tissue the stress relaxation and creep phenomenon were investigated using universal Instrom 6022 apparatus. The experiment was performed for roots of PN Mono 1 variety, in 3 measuring zones of different location in the root and different wooden bundles arrangement. For mathematical description of these phenomena the equations of three-parameter, standard rheological model were applied and the model parameters were calculated by means of least square method. The mathematical parameters of beet root tissue are different in upper and lower part of root due to its untypical, diversified anatomical structure. Low matching error and high correlation coefficient testify to the significant consistence of experimental and theoretical results.