A b s t r a c t. With the purpose of controlling the process of wet cornstraw bales storage, physical and fluidic properties of corn straw have been measured. This paper brings an analysis of the results obtained, aiming at a general mathematical expression of particles resistance dependence on several variables expressing the properties of corn straw. For the purpose of cornstraw analysis NSKK-606, the most fertile hybrid corn from Novi Sad, was chosen. Samples were selected regarding moisture content compared to the wet base, so as to be near characteristically values: 80, 60, 40 and 20 %, v/V. The cornstraw was chopped to the theoretical particles length of 40 mm, with the 'Lifam' stationary cutter with two L shapped rotating blades. 1be air flow resistance of particles through the compressed and an compressed cornstraw were measured with the experimental test set up. On the basis of regressional analysis of the experimental results concerning physical and fluidic properties of chopped, wet, compressed and uncompressed cornstraw a simplified analytical expression has been established for calculation of aerodynamic material particles at air flow through the cornstraw layer (Eq. (10)). By means of regressional analysis the values of particle resistance coefficient K of the exponent a over air flow velocity in the layer v, of the exponent b over the layer density ρ and of the exponent c over moisture content w, have been obtained for chopped cornstraw samples.