Resumo

RAMIREZ-PEDROSO, Juan Francisco et al. Arbuscular-mycorrhizal inoculation and reduction of organic and nitrogen fertilization in Megathyrsus maximus cv. Likoni. Pastos y Forrajes [online]. 2017, vol.40, n.2, pp. 108-117. ISSN 2078-8452.

The effect of the arbuscular-mycorrhizal inoculation on the reduction of organic and nitrogen fertilization in Guinea grass (Megathyrsus maximus cv. Likoni), cultivated on a Ferruginous Gley Nodular soil, located in the Cascajal locality, Villa Clara province, Cuba, was evaluated. Thirteen treatments were studied, formed by: absolute control, applications of 12,5 and 25 t of cattle manure ha^-1 combined with 0, 105 and 150 kg N ha^-1 year^-1, with and without inoculation of the mycorrhizal fungus Funneliformis mosseae. The design was randomized blocks with four replications. The cattle manure increased pH and the contents of organic matter, assimilable P and exchangeable K of the soil; the highest effects were obtained with 25 t ha^-1. In the absence of inoculation, the highest dry matter yields (16,57 t DM ha^-1) and N (18,9 g kg^-1 DM), P (2,3 g kg^-1 DM) and K concentrations (17,9 g kg^-1 DM) in the biomass were reached with the addition of 25 t of manure ha^-1 and 105 kg N ha^-1. These treatments showed the highest frequency and intensity of mycorrhizal colonization (57,7 and 58,2 %) and the highest number of spores (503 and 491 spores/g of soil) of arbuscular-mycorrhizal fungi (AMF) in the rhizosphere. With the inoculation of F. mosseae at the moment of planting, the cattle manure doses and the nitrogen fertilizer can be reduced in 50 and 30 %, respectively, without affecting the nutrient content in the biomass or the yield, during two years of crop growth.

Palavras-chave : chemical composition; plant nutrition; yield.

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