Fungo micorrízico arbuscular e extrato de algas no crescimento inicial de porta-enxerto de aceroleira

The use of natural bio-stimulant in the early development of rootstock acerola, along with the use of mycorrhizal association, represents an alternative to supplement the nutritional demands of plants and consequently stimulates the growth of seedlings. Marine algae have been recognized as excellent natural fertilizer and bio-stimulants for plants. Arbuscular mycorrhizal fungi can be used as natural biofertilizers on seedling production. The objective of this study was to evaluate the initial growth and the doses of seaweed (Ascophyllum nodosum) in the production of rootstocks Malpighia emarginata inoculated with the fungus Glomus fasciculatum. The experiment was distributed in a completely randomized design in corresponding to two treatments involving arbuscular mycorrhizal fungi (0.0 and 1.0 g of inoculum per 10 g seed) and four treatments factorial (2 × 4) extract applications involving seaweed (doses 2, 4 and 6 mL L-1) and control (no application), with five replications. Data were subjected to normality test and, when presented normal, there was analysis of variance and comparisons of means and polynomial regression. The use of seaweed at a dose of 6.0 mL L-1 of the extract, together with the association of mycorrhizal fungus Glomus fasciculatum, can provide increased productivity in the nursery and shorter production rootstock acerola