Hidrolisados de resíduos de raízes e caules de tabaco para estimulação da germinação de sementes de arroz e milho.

Abstract

The present study aimed to evaluate the influence of four tobacco hydrolysates produced by alkaline and acid attack from the tobacco waste (root and stem) on seed germination process of Oryza sativa (rice) and Zea mays (corn). For the experiments, paper towel (germitest), soaked in distilled water with volume (mL) of 3 times its weight, was used as substrate. In the planning, it was accomplished 16 treatments of 50 seeds each, with 4 replicates, imbibed with tobacco hydrolysates and diluted at 20 and 80%. The pH was adjusted in 5 to 8. The imbibition step it was used 2 and 3 mL for 48 and for the control the seeds were imbibed in distilled water in the same volumes and time of imbibition. The incubation was in the germination chamber at a temperature of 25ºC. The experiments followed the RAS Manual (Brazil, 2009). The first opening was on the second day after the incubation for the germinated seed count, the protrusion of the radicle was used as criterion. On the fourth and seventh day, radicles and aerial parts were collected to dry out and weigh. The hydrolysates produced by alkaline and acid attack had in their composition amino acids and sugars are important for the stimulation of the germination process. It was concluded that the hydrolysates do not significantly influence the acceleration of germination; however, the results were promising to consider these solutions from tobacco residues (stem and root) as potential to stimulate seedling growth of both cultures tested (rice and corn).