Arbuscular mycorrhizal fungi and Azotobacter chroococcum in obtaining coconut seedlings
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Abstract
The coconut is a widely spread crop, with importance in food, cosmetics and industry; however, its production is affected, among other factors, by the aging of the plantations, which affects productivity levels, for which it is essential to obtain quality postures for the repopulation of the production areas. With the aim of studying the combined effect of arbuscular mycorrhizal fungi (AMF) and Azotobacter strains in the production of high-quality coconut seedlings, an experiment was carried out in two nurseries in Baracoa, Guantánamo, Cuba, of which two repetitions in time. The domesticated coconut ecotype "Indio Verde-1" was used in two soils, Arenosol háplico (ARh) and Gleysol Flúvico háplico (GFLh), with the inoculation of three strains of AMF (Glomus cubense, Rhizophagus irregularis and Funneliformis mosseae) and two of A. chroococcum (CDM-1 isolated from ARh soil and CDM-2 from GFLh soil). A differential response of AMF species was observed in both soils. The inoculation with R. intraradices favored the increase of the variables seed germination, height, stem diameter and number of leaves, in the ARh soil when its inoculation was combined with the strain A. chroococcum CDM-1, while G. cubense was the best soil treatment GFLh, combined with A. chroococcum CDM-2. Although high levels of autochthonous AMF strains were quantified in both soils (control), the inoculated strains proved to be more efficient than these for obtaining quality seedlings.
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