Determination of the Rheological Properties of two Potato Varieties under Conventional and Cold Storage Conditions

Storage of potato is essential for the continuous supply of raw materials for domestic and industrial use.Dueto structural changes (tissue) and followed by changes in the mechanical properties of the tubers during storage and its impact on product quality, the information of the mechanical properties of potato tubers reduces losses and economic lossespartly along with other factors.In this research two potato genotype (Agria and Clone397009-8) were stored in two technical and non-technical storage for three monthsin Ardebil.The uniaxial compression test was used to measure the effect of variety,storage temperature and storage duration on elastic modulus, failure force and failure energy, and penetration test to measure hardness and penetration energy.Measurement was done weekly and the final results were reported after the storage period. The results showed thatcultivar, storage temperature and storage duration have a significant effect on all mechanical properties in both cultivars.With increase storage time, the elastic modulus, failure force, failure energy, hardness and penetration energy in technicalstorage were lower than non-technical storage,which this difference was statistically significant (P <0.05). The results showed that cultivar Agria has a higher elastic coefficient and rigidity than Clone genotype because of rigid texture and asa result, the storage period is longer.