Azospirillum brasilense associated with nitrogen fertilization in Urochloa humidicola pastures cultivated in the Amazonian savanna

José Wilker Leal Castro; Jalison Lopes; Eduardo Medeiros Severo; Vicente Batista de Souza Junior; João Luiz Lopes Monteiro Neto; Naiara Caixeta da Silva; Wilton Ladeira Silva

doi:10.1590/1809-6891v26e-81007E

Authors

José Wilker Leal Castro Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil https://orcid.org/0000-0002-2651-7724
Jalison Lopes Universidade Federal de Roraima (UFRR), Boa Vista, Roraima, Brazil https://orcid.org/0000-0002-6163-0183
Eduardo Medeiros Severo Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brazil https://orcid.org/0000-0003-4904-7814
Vicente Batista de Souza Junior Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil https://orcid.org/0000-0001-7835-1255
João Luiz Lopes Monteiro Neto Universidade Federal de Roraima (UFRR), Boa Vista, Roraima, Brazil https://orcid.org/0000-0002-8300-5928
Naiara Caixeta da Silva Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil https://orcid.org/0000-0003-4980-8740
Wilton Ladeira Silva Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil https://orcid.org/0000-0003-3116-0608

DOI:

https://doi.org/10.1590/1809-6891v26e-81007E

Abstract

The objective of this study was to assess the impact of Azospirillum brasilense in conjunction with nitrogen fertilization on structural, morphogenetic, yield-related, and chemical characteristics of Urochloa humidicola cultivated in the Amazon savannah. Treatments consisted of five nitrogen application rates (0, 50, 100, 150, and 200 kg ha-1), both with and without A. brasilense inoculation. The experiment was laid out in a completely randomized design with a 5×2 factorial arrangement, including four replications. The morphological composition of the pastures, morphogenetic and structural characteristics and chemical composition of the forage were evaluated. The utilization of A. brasilense, either alone or combined with nitrogen fertilization, did not influence the enhancement of forage yield. However, nitrogen fertilisation led to consistent increases in production, primarily through an increase in leaf and culm components and a reduction in the proportion of dead material in pastures. It also led to a linear increase in the proportions of NDF, ADF and CP in the forage. The use of A. brasilense does not alter the production and chemical composition of the forage, while nitrogen fertilization favors the management of pastures with U. humidicola grown in Amazonian savanna soil.

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Author Biography

Wilton Ladeira Silva, Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil

2010-2014 - Faculdade de Ciências Agrárias e Veterinárias, Unesp, Jaboticabal Pós-Graduação - Doutorado em Zootecnia na área de concentração em Produção Animal e na linha de pesquisa de Plantas Forrageiras, Produção, Manejo e Conservação. Bolsista da FAPESP.

2012 – University of Florida, UF, United States – Range Cattle Research & Education Center Doutorado Sanduíche no Exterior

2008 – 2010 - Faculdade de Ciências Agrárias e Veterinárias, Unesp, Jaboticabal Pós-Graduação - Mestrado em Zootecnia na área de concentração em Produção Animal e na linha de pesquisa de Plantas Forrageiras, Produção, Manejo e Conservação. Bolsista do CNPq.

2003 - 2008 - Universidade Federal de Viçosa, UFV, Brasil Graduação em Agronomia – Bolsista de Iniciação Científica do CNPq

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