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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 |
Aparece nas coleções: | Solos - Artigos |
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Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | Texto completo | 1,39 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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