|
|
|
|
|
| Schmeer, Maria; Dittert, Klaus; Loges, Ralf; Taube, Friedhelm. |
| Aim of the presented study was the comparison of the specific emissions of CO2 equivalents of a legume based and a mineral N fertilised grassland considering the N2O emissions caused by N fertilisation and soil compaction. The field trial was set up on the experimental station “Hohenschulen” in northern Germany with the factors soil compaction, N fertilisation and experimental year. The N2O emissions were affected by an interaction of soil compaction and N fertilisation, especially under moist spring conditions. The specific CO2-equivalent emission per unit energy yield was 67 % higher for the mineral N-fertilised grassland compared to the legume based grassland. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2011 |
URL: http://orgprints.org/17590/3/Loges_17590.pdf |
| |
|
|
| Petersen, Søren O.; Bol, Roland; Dittert, Klaus; Christofides, Calliopi; Roslev, Peter; Hansen, Martin N.. |
| Managed grasslands can accumulate soil organic carbon and thereby remove CO2 from the atmosphere. When grazed, however, the interaction between N inputs (fertilization, feeding, N fixation) and excretal returns can lead to sward deterioration and elevated emissions of N2O in urine patches. Both effects may reduce the positive effect of carbon storage on the greenhouse gas balance. A field plot study was carried out between 19 September and 4 October 2001, in which cattle urine amended with 13C- and 15N-labelled urea was added to a sandy loam pasture. Two levels of urea, corresponding to 23.3 and 39.8 g urea-N m-2, were compared with an unamended control. Ammonia losses corresponded to 14 and 12% of the urea-N applied in the low (UL) and high (UH) urea... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/2906/1/Ghent_presentation_020604.ppt |
| |
|
|
| Bol, Roland; Petersen, Søren O.; Christofides, Calliopi; Dittert, Klaus; Hansen, Martin Nørregaard. |
| Urine patches are significant hot-spots of C and N transformations. To investigate the effects of urine composition on C and N turnover and gaseous emissions from a Danish pasture soil, a field plot study was carried out in September 2001. Cattle urine was amended with two levels of 13C- and 15N-labeled urea, corresponding to 5.58 and 9.54 g urea-N l-1, to reflect two levels of protein intake. Urine was then added to a sandy-loam pasture soil equivalent to a rate of 23.3 or 39.8 g urea-N m-2. Pools and isotopic labeling of nitrous oxide (N2O) and CO2 emissions, extractable urea, ammonium (NH4+), and nitrate (NO3-), and plant uptake were monitored during a 14 d period, while ammonia (NH3) losses were estimated in separate plots amended with unlabeled urine.... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/4060/1/4060.pdf |
| |
|
|
|
