Nitrogen use efficiency in an agrisilviculture system with gliricidia sepium in the Cerrado Region

• Autor(a) principal: Figueiredo, Cícero Célio de
• Data de Publicação: 2023
• Outros Autores: Moreira, Túlio Nascimento, Coser, Thais Rodrigues, Silva, Letícia Pereira da, Leite, Gilberto Gonçalves, Carvalho, Arminda Moreira de, Malaquias, Juaci Vitória, Marchão, Robélio Leandro, Urquiaga, Segundo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UnB
• Texto Completo: http://repositorio2.unb.br/jspui/handle/10482/46720; https://doi.org/10.3390/plants12081647; https://orcid.org/0000-0002-7496-0261; https://orcid.org/0000-0003-1922-7929
• topic: Sistema agroflorestal; Gliricídia; Adubação nitrogenada

Gliricidia (Gliricidia sepium) is a tree legume that has great potential for use in agriculture because of its multiple-use characteristics. However, there is little information in the literature about the effect of agrisilvicultural systems on nitrogen (N) cycling. This study evaluated the effect of densities of gliricidia on N cycling under an agrisilvicultural system. The treatments were composed of different densities of gliricidia: 667, 1000 and 1333 plants ha−1, with a fixed spacing of 5 m between the alleys. The efficiency of N use was investigated by using the 15N isotope tracer. In each plot, a transect perpendicular to the tree rows was established in two positions: (i) in the corn (Zea mays) row adjacent to the trees, and (ii) in the corn row in the center of the alley. The N fertilizer recovery efficiency ranged from 39% in the density of 667 plants ha−1 to 89% with 1000 plants ha−1. The effect of gliricidia on the N uptake by corn was higher in the central position of the alley with 1000 plants ha−1. The agrisilvicultural system with 1000 plants ha−1 was highly efficient in the recovery of mineral N, representing an excellent option for integrated production systems in tropical regions.