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Universität Bonn
Landwirtschaftliche Fakultät
Dr. med. vet. Susanne Plattes

Meckenheimer Allee 172
53115 Bonn-Poppelsdorf

Tel: +49 (0)228-73 9418
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Inga Schiefler (2013)

Greenhouse gas and ammonia emissions from dairy barns

Diss. agr., Rheinische-Friedrich-Wilhelms-Universität Bonn.

Livestock farming is blamed to bear the bulk of certain gaseous emissions from agriculture such as ammonia (NH3) and methane (CH4). Emission measurement in naturally ventilated buildings in general, but the determination of the air exchange rate in particular, is very complex. Consequently, there is a lack of knowledge regarding gaseous emissions from modern, naturally ventilated dairy cattle buildings. The objectives of the thesis comprise the development and the utilization of measuring and modelling methods in order to determine NH3 and CH4 emissions from dairy barns. The first study focused on the development of a robust method for the long-term measurement of CH4 and NH3 emissions from a naturally ventilated dairy barn. A rough but solid model for the calculation of the ventilation rate by means of wind parameters was developed. At zero wind speed, the ventilation level in the building was over 870 m3 h-1 LU-1 and each m s-1 increase in wind speed increased the ventilation rate by 1,500 m3 h-1 LU-1. The second study presents results of a one-year measurement campaign in a tripartite, naturally cross ventilated dairy barn allowing for an accurate comparison of the two housing systems slatted floor and solid floor including emissions from barn and storage. Emissions from slatted floor including storage with low intensity of slurry homogenization led to lowest NH3 and CH4 emissions (324.9 ± 123.6 g CH4 LU-1 and 29.8 ± 13.1 g NH3 LU-1 d-1 as annual average, respectively). The effect of slurry homogenization beneath the slatted floor was affecting the level of both CH4 and NH3 emissions in a similar way (+17 and +29% higher emissions due to higher intensity of manure homogenization). Furthermore, in the third chapter emission modelling and measuring science was brought together and discussed in an interdisciplinary study. Therefore, the greenhouse gas calculation module of the dairy farm-level model DAIRYDYN was validated by long-term measurement data. The comparison of indicator-modelled CH4 emissions with online measurements offered relatively moderate deviations in case of very detailed indicator schemes (between -6.4 and 10.5%) compared with findings from literature. As a whole, the thesis contributes to the development and improvement of measuring methods for gaseous emissions from naturally ventilated dairy barns offering links for further research activities in this field. The thesis provides emission factors for different housing systems and manure management practices for dairy cows.
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