Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/21329
Tipo: Artigo
Título: Value of copper, zinc, and oxidized charcoal for increasing forage efficiency of urea N uptake
Autor(es): Guimarãesv, Gelton G.F.
Mulvane, Richard L.
Cantarutti, Reinaldo B.
Teixeira, Breno C.
Vergütz, Leonardus
Abstract: Volatilization losses reduce the efficiency of surface-applied urea for crop N uptake, and can be controlled using urease inhibitors to retard hydrolysis or by the presence of other amendments that enhance retention of NH4+ formed by urea hydrolysis. A greenhouse study was conducted to evaluate the effectiveness of oxidized charcoal (OCh; 150 g kg−1 fertilizer) applied with or without Cu and/or Zn (∼0.5–2 g kg−1 fertilizer), and of Cu and/or Zn applied without OCh, for increasing uptake of urea 15N by a common tropical pasture grass, capim-Mombaça (Panicum maximum Jacq. Cv. Mombaça), grown on a coarse-textured Oxisol. Cuttings were collected 5, 14, 28, 42, and 56 days after surface placement of amended or unamended urea pellets to estimate dry matter production, total N uptake, and 15N recovery. Soil sampling was carried out in conjunction with the first and fourth cuts to evaluate exchangeable NH4+ and NO3− concentrations. At the concentrations studied, OCh was more effective than Cu and/or Zn for prolonging NH4+-N availability in urea-treated soil; however, OCh alone or in combination with Zn and Cu had no effect on biomass production or N recovery and can safely be eliminated as a useful option for pasture improvement. The most promising amendment was Zn, which significantly increased total N uptake and the efficiency of urea N fertilization. The use of Zn in conjunction with urea has practical potential to improve forage production on tropical soils.
Palavras-chave: Forage production
Urease inhibitors
15N
Zn fertilization
Zn-N synergism
Editor: Agriculture, Ecosystems & Environment
Tipo de Acesso: Elsevier B.V.
URI: https://doi.org/10.1016/j.agee.2016.03.036
http://www.locus.ufv.br/handle/123456789/21329
Data do documento: 15-Mai-2016
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