Germinação e desenvolvimento inicial de milheto com uso de bioestimulante sob diferentes temperaturas

Abstract

Millet is an important summer grass used as fodder due to its good bromatological characteristics, easy adaptation to Brazilian environmental conditions and mainly due to the high capacity of biomass production. However, when sowing the crop early in the southern region, that low temperatures affect the germination and initial development of the seedlings. Thus, the present work had the objective of evaluating the germination and initial development of millet using Biozyme TF ® biostimulant as a way to attenuate the effects of different temperatures. The experimental design was completely randomized, in a factorial scheme 3 x 5 (temperatures x doses) with four replicates each. The temperatures used were 15 ° C, 20 ° C and 25 ° C and the doses used were: 0 (control); 0.25; 0.5; 0.75 and 1 ml kg-1. After the treatment, the seeds were evaluated as: germination, germination speed index, shoot length and root and dry matter accumulation of the seedlings. The data were submitted to analysis of variance by the Tukey test at 5% of probability using the Sisvar® program and, when found significant, the regression analysis was performed. The germination of millet seeds was favored, under low temperature stress conditions, with seed treatment at a dose of 0.50 mL kg -1 of biostimulant. The biostimulant did not influence the speed of germination of the seeds of millet. At the three temperatures there was no significant effect of Biozyme TF® under the root length of the millet seedlings. Under the condition of low temperature thermal stress, the biostimulant minimally increased the length and dry mass accumulation of shoot millet seedlings. The accumulation of dry mass of the roots decreased with increasing dose of the biostimulant under thermal stress condition.