Efecto de la asociación de ajo (Allium sativum) y cebolla (Allium cepa) para el control del Damping off en la producción de plántulas de Maracuyá (Passiflora edulis Sims. f. Flavicarpa Deg.) durante la etapa de vivero.

The sexual reproduction of passion fruit should be made knowing the origin of the seeds, which ensures the quality of the plants for transplantation, for this is indispensable in the multiplication of seedlings with substrates that provide the conditions conducive to their growth. The effect of the associations of passion fruit + onion (Allium cepa) and passion fruit + garlic (Allium sativum), also unrelated passion fruit, was evaluated in two different substrate conditions: infected, plant soil diseased by the pathogen; And disinfected, soil treated by the solarization technique, for the control of Damping off. In this experiment was used recycled seed of the area. A completely randomized experimental design was applied within a bifactorial arrangement with four treatments T1 (Infected-alone), T2 (Infected-Associated), T3 (Disinfected-Solo) and T4 (Disinfected-associated) M2. The variables evaluated were: percentage of germination, survival percentage, plant height, stem diameter, leaf number, root volume, root length, root diameter, fresh air weight, aerial biomass, fresh root weight, Percentage of dead plants, benefit / cost ratio and profitability. For germination and survival in the course of the research showed significant differences (P <0.05) for the treatments of systems associated to 15 and 50 days. Regarding the agronomic behavior, the interactions of associated systems could show a positive response in all variables. The highest percentage of dead plants was obtained in the culture system alone. According to the economic analysis of the production of passion fruit seedlings, it can be determined that the T4 (disinfected -associated) obtained the highest net profit, with a feasible profitability. For this, it is concluded that the use of seedlings that exude alchemical compounds and suitable substrates improves the development and nutrition of the plant and soil.