Response of Yacare (Urochloa hibrido cv. CIAT BR02/1752) pasture to biofertilization with arbuscular mycorrhizal fungi
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Abstract
With the aim to evaluate the biofertilization effectiveness with arbuscular mycorrhizal fungi in Yacaré pasture (Urochloa hybrid) cultivated in Lixiviated Ferrallitic Red soil, an experiment was carried out at Niña Bonita Genetic Cattle Enterprise. Four treatments were evaluated: three species of arbuscular mycorrhizal fungi (AMF), Glomus cubense, Funneliformis mosseae, and Rizhophagus irregularis, in addition to a control without inoculating, distributed in a Latin square design. Different species inoculation of AMF was carried out at sowing time. The indicators evaluated were the frequency and intensity of mycorrhizal colonization, AMF spore number in the rhizosphere, the NPK biomass concentrations, the dry mass yield of the pasture and its nutritive value, as well as the efficiency index and AMF strains influence in pasture nutrition. All the strains produced significant increases in the evaluated variables; nevertheless, when G. cubense was inoculated, increases in the efficiency index and in pasture nutrition were obtained. It is concluded that biofertilization with G. cubense can be an effective agronomic practice to improve the yield and nutritive value of the Yacare pasture cultivated in Lixiviated Ferrallitic Red soil.
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