Resumen

LARUTA ALVAREZ, Ana Melisa  y  MALDONADO FUENTES, Casto. Efficient microorganisms (EM-1®) and mountain microorganisms in coffee seedlings (Coffea arabica L.), Caranavi - La Paz. Apthapi [online]. 2021, vol.7, n.2, pp. 2134-2144. ISSN 0102-0304.

ABSTRACT: Efficient microorganisms of natural origin, with populations of lactic acid bacteria, phototrophic bacteria, yeasts, actinomycetes and fermenting fungi, are considered beneficial for improving the physical, chemical and biological fertility of soils, thus creating a favorable environmentfor the plant. The research was carried out in Caranavi, La Paz, Bolinda colony to evaluate the efficiency of a commercial product Efficient Microorganisms (EM-1^®) and Mountain Microorganisms (MM) prepared by hand and their responses at different concentrations, in the agro-morphological behavior of coffee seedlings, Seven treatments were evaluated at three different concentrations under a completely randomized design: T1 (EM-1^® at 1 %), T₂ (EM-1^® at 3 %), T₃ (EM-1^® at 6 %), T₄ (MM at 1 %), T₅ (MM at 3 %) and T₆ (MM at 6 %) and the control (T0). To evaluate the effect of the treatments on the substrate, the initial and final physical and chemical characteristics were determined, with T6 showing a better response due to an increase in porosity, organic matterand a pH close to neutral. Amongthemorphological variables, the application of efficient microorganisms stimulated seedling development, with statistically significant differences compared to the control in T1, T2, T4, T5 and T6. The application of MM at 3% concentration (T5) registered higher average values in number of leaves at transplanting (7.33 leaves), leaf blade width (5.78 cm), leaf blade length (13.3 cm), stem diameter (4.06 cm), main root length (19.97 cm) and lateral root length (27.15 cm). The use of local MM was more profitable than the commercial product EM-1^®, considering the responses of T₅as a local product.

Palabras llave : Efficient microorganisms; mountain microorganisms; fertility; coffee (Coffea arabica L.).