Value of copper, zinc, and oxidized charcoal for increasing forage efficiency of urea N uptake
Guimaraes, GGF; Mulvaney, RL; Cantarutti, RB; Teixeira, BC; Vergutz, L
| HERO ID | 3427747 |
|---|---|
| In Press | No |
| Year | 2016 |
| Title | Value of copper, zinc, and oxidized charcoal for increasing forage efficiency of urea N uptake |
| Authors | Guimaraes, GGF; Mulvaney, RL; Cantarutti, RB; Teixeira, BC; Vergutz, L |
| Journal | Agriculture, Ecosystems & Environment |
| Volume | 224 |
| Page Numbers | 157-165 |
| 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 (similar to 0.5-2 g kg(-1) fertilizer), and of Cu and/or Zn applied without OCh, for increasing uptake of urea N-15 by a common tropical pasture grass, capim-Mombasa (Panicum maximum Jacq. Cv. Mombasa), 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 N-15 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. (C) 2016 Elsevier B.V. All rights reserved. |
| Doi | 10.1016/j.agee.2016.03.036 |
| Wosid | WOS:000375809900017 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Forage production; Urease inhibitors; N-15; Zn fertilization; Zn-N synergism |