Abstract

FRAILE-ROBAYO, Ana Lucía; ALVAREZ-HERRERA, Javier Giovanni  and  DEAQUIZ-OYOLA, Yuli Alexandra. Effect of gibberellins on the propagation of the tomato (Solanum lycopersicum L.) with different substrates enriched with fertilizer. rev.colomb.cienc.hortic. [online]. 2012, vol.6, n.1, pp.41-54. ISSN 2011-2173.

In the tomato, the use of seedbeds causes a high production cost, therefore alternatives are being sought that provide optimal characteristics of germination and seedling growth that are both economically viable and available. This study evaluated the response of Calima hybrid tomato seeds treated before sowing with five concentrations of gibberellic acid (0, 200, 400, 600, 800 mg L^-1), planted in burned rice husks (CAQ) and enriched with different doses of nitrogen, phosphorous and potassium (90-75-180, 45-30-135 and 75-60-165, 60-45-150 mg L^-1) respectively, at 12, 16 and 20 days after planting; and compared with peat moss. We used a completely randomized design with 25 treatments and four replications; each experimental unit had 20 seeds. The concentration of 400 mg L^-1 positively affected the mean germination time and the speed of germination, but had no effect on the development of the seedlings. The CAQ substrate enriched with fertilizer presented seedlings with lower development as compared to peat moss, while the mixture of peat moss plus 400 mg L^-1 GA₃ had the fastest growing seedlings which expressed a height of 10 cm, a stem diameter of 3.1 mm and 0.64 g of fresh biomass.

Keywords : germination; seedling; burned rice husks; peat.

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