Value of copper, zinc, and oxidized charcoal for increasing forage efficiency of urea N uptake

Show simple item record Guimarãesv, Gelton G.F. Mulvane, Richard L. Cantarutti, Reinaldo B. Teixeira, Breno C. Vergütz, Leonardus 2018-08-22T18:27:56Z 2018-08-22T18:27:56Z 2016-05-15
dc.identifier.issn 01678809
dc.description.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. en
dc.format pdf pt-BR
dc.language.iso eng pt-BR
dc.publisher Agriculture, Ecosystems & Environment pt-BR
dc.relation.ispartofseries v. 224, p. 157- 165, May 2016 pt-BR
dc.rights Elsevier B.V. pt-BR
dc.subject Forage production pt-BR
dc.subject Urease inhibitors pt-BR
dc.subject 15N pt-BR
dc.subject Zn fertilization pt-BR
dc.subject Zn-N synergism pt-BR
dc.title Value of copper, zinc, and oxidized charcoal for increasing forage efficiency of urea N uptake en
dc.type Artigo pt-BR

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    Artigos Técnico-científicos na área de Solos

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