Amaranth is one of the oldest crop plants in the world, originating from South America and more and more frequently referred to as the cereal of the 21^st Century. The period of amaranth vegetation is 160 days. The optimum temperature during vegetation is 26–28°C, and it grows and develops the best within the temperature range of 16°C to 35°C. In the laboratory experiment the germination capacity of seeds was determined. Amaranth seeds were sown on Petri dishes, at 100 seeds per dish in a climate – controlled chamber at temperatures of 10°C, 12°C, 15°C, 20°C, 25°C, 35°C, 45°C, 55°C, in total darkness. Parameters of seeds germination of amaranth cv. Aztek was obtained by modeling of logistic curve: N_T = N_K [1+exp(β– Kt)]^-1. Germination of amaranth seeds of both cultivars, for all the kinds of stimulation and for the control samples, was the highest at temperatures of ca. 20°C and ca. 42°C, and the lowest at 10°C.

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