Efectividad de la inoculación de hongos micorrízicos arbusculares en dos leguminosas forrajeras cultivadas en dos tipos de suelo

Abstract

In Bauta, Artemisa province, Cuba, 2 field experiments were conducted in Nitisol and Vertisol soils to evaluate the response of the pasture legumes, stylo ( Stylosanthes guianensis ) and siratro ( Macroptilium atropurpureum ), to inoculation with arbuscular mycorrhizal fungi (AMF). In each experiment, inocula with the AMF species Funneliformis mosseae, Glomus cubense and Rhizoglomus intraradices were applied, and there was a control without inoculation. A randomized block design with a 4 (inocula) x 2 (legume species) factorial arrangement was used giving 8 treatments and 4 replications. AMF inocula were applied at sowing by the seed-coating method, and legume yield, the frequency and intensity of mycorrhizal root colonization and macronutrient concentrations in aboveground biomass were evaluated. The legumes responded positively to AMF inoculation, but the effectiveness of the AMF species depended on the soil type. Rhizoglomus intraradices was more effective with respect to the frequency and intensity of mycorrhizal root colonization and in improving the nutritional status and yield of legumes grown in the Vertisol, whereas G. cubense was more effective for those grown in the Nitisol. Studies are required to identify the soil factors that determine the effectiveness of AMF. Keywords: Macroptilium atropurpureum , mineral nutrition, Nitisol, soil fertility, Stylosanthes guianensis, Vertisol. DOI: 10.17138/TGFT(4)82-90