EFFECTS OF TEMPERATURE, SUBSTRATE AND LUMINOSITY CONDITIONS ON CHIA SEED GERMINATION

The aim of the present study was to evaluate the effects of temperature, substrate, and luminosity on chia seeds in order to determine adequate conditions for a germination test. The experiment consisted of a completely randomized design, in a 4 x 5 x 2 factorial scheme (four substrates x five temperatures x two luminosity conditions), with four replications. The following variables were analyzed: first germination count, germination, germination speed index, and mean germination time. Germination was best at 15, 20, 25, and 30 degrees C for the on-paper, paper roll, and sand substrates. However, in the presence of luminosity and at 25 degrees C, the on-paper substrate had the highest mean. For all substrates, the lowest germination was achieved at 35 degrees C, proving that high temperatures reduce chia seed germination. Germination speed index was highest at 25 and 30 degrees C for on-paper, paper roll, and sand substrates, in both the presence and absence of luminosity. Chia seeds are considered to be neutral photoblasts. Germination tests should be performed with the on-paper substrate, at 25 degrees C, and with a duration of seven days. The first count should be carried out four days after establishment of the test.