Stimulate® na germinação de sementes, no vigor e crescimento inicial do Maracujazeiro amarelo

Abstract

The objective was to evaluate the physiological effects of applying Stimulate® via leaf and seed germination of seeds, initial force of seedlings and early growth of Passiflora edulis Sims f. flavicarpa Deg. The bio regulator used was Stimulate®, composed of 0,005% of indolebutyric acid, 0,009% of kinetin and 0,005% of gibberellic acid, in the first phase, the seeds were imbibed for six hours in this bio regulator concentration: 0,0 (control); 8,0; 14,0; 20,0; 26,0 e 32,0 mL of Stimulate® L-1 in solution. Then, the seeds were left to dry in the shadow. The treated seeds were submitted to the Germination Standard Test. It was evaluated the germination percentage, percentage of normal and abnormal plants, dead seeds, stiff seeds, and emergence speed rate of seedlings. In the second stage, it was evaluated the Stimulate® effect in the initial growth of passion fruit plants. The treatments were: 0,0 (control); 8,0; 14,0; 20,0; 26,0 and 32,0 mL of Stimulate® kg-1 of seeds applied directly over the seeds. Then, the seeds were sowed in 2-kilo polyethylene bags containing four seeds per bag. After a thinning, one plant was left per bag. To leave spraying it was used the same doses of Stimulate® diluted in distilled water from the 43rd day after the sowing (DAS), during nine days. It was evaluated in the 70th DAS: number of leaves, stem length, root length, full length of the plant. The statistic design was entirely random with six treatments and four repetitions. The results were submitted to analysis of variance and polynomial regression. The Stimulate® by providing efficient seed is more vigorous seedlings of fruit and greater length. The bio regulator promotes positive effect in the initial growth of passion fruit plants, increasing average height and dry mass.