Knowledge of apparent elastic properties such as Poisson’s ratio and elastic modulus of agricultural seeds are important for the prediction of their load-deformation behavior and design of their process machines. The object of this study was investigated to test the applicability of three different methods existing in elasticity theory namely Hook s theory, Hertz theory and Boussinesq s theory for evaluation of the modulus of elasticity of agricultural seeds, as well as to study its general behavior under compressive loads and selection of the best theory among three reviewed theories. As a case study, the results of comparison elastic modulus of wheat determined on the basis of using above three theories were considered. The obtained results showed that Hertz theory (Parallel plates contact) is more suitable because of good agreement between theoretical and experimental results of force deformation curve. Also, between the four testing methods of loading of wheat the cylindrical indenter and core specimens give the lowest value while the parallel plate s method shows the highest values.

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