Among the various germination factors (Ghaderi et al., 2008), temperature is the most prominent environmental factor regulating growth and development of plants (Koger et al., 2004). The temperature (optimum) at which the maximum germination and emergence percentage are recorded tends to differ among crops. Clear understanding of the germination and emergence response of crop seeds to temperature, obtained by determining cardinal temperatures, is important, because it enables identification of tolerance to low and high temperatures, and climatic conditions under which particular crops can germinate and establish successfully. It also assists in the construction of models that predict crop development processes (Ghaderi et al., 2008).