TY - CHAP

T1 - Modelling ammonia emissions after field application of biogas slurries

AU - Pacholski, Andreas Siegfried

AU - Gericke, Dirk O.

AU - Ni, K.

AU - Quakernack, Robert

AU - Kage, Henning

N1 - Conference code: 14

PY - 2010

Y1 - 2010

N2 - 14th Ramiran International Conference, Lisboa 12-15th September 2010860237-Modelling ammonia emissions after field application of biogas slurriesAndreas Pacholski, Dirk Gericke, Ni Kang, Quakernack Robert, Kage HenningChristian-Albrechts-University at Kiel, Institute of Crop Science and Plant Breeding,Agronomyand Crop Science, Kiel, GermanyIn Germany, the production of biogas from energy cropping systems has been in the focus of thenational bio-energy strategy for the reduction of greenhouse gas emissions since the year 20004.Their greenhouse gas saving benefit can be strongly decreased by other adverse environmentaleffects induced by biogas systems as greenhouse gas and ammonia emissions.Ammoniaemissions which are unavoidable as biogas slurries have to be re-transferred to the field as N-fertilizers, contribute indirectly to greenhouse gas emissions. In addition ammonia emissions arethe main source of eutrophicating and acidifying compounds deposited on natural and semi-natural ecosystems.There is thus an urgent need to quantify NH3 emissions from biogasproduction systems. For scenario and regionalisation simulations, model approaches for NH3emissions after field applications of biogas slurries are of particular interest.Model development was carried out on the basis of intensive ammonia loss field measurementscarried out in the years 2007-2009 in biogas cropping systems grown in Northern Germany.Altogether 18 experimental campaigns including the simultaneous measurement of severalanimal and biogas slurries were carried out in multiple plot field experiments using different N-fertilization levels. For the determination of NH3 emissions micrometeorological as well as plotbased measurement approaches were used and subsequently cross- checked.Several new dynamic and empirical model approaches were tested which can be applied for thecalculation of NH3 losses after field application of biogas and animal slurries to energy crops. Inaddition to the well known principles for calculation of ammonia losses based on temperature, pHand soil water relationships new algorithms were implemented to account for the effects of slurryincorporation, crop type, canopy structure and precipitation on NH3 emissions. Model resultsshowed a good agreement with measured data with respect to both simulated ammonia lossdynamics as well absolute final losses.As compared to validation data the models show aquantitative accuracy of cumulated NH3 losses in between 1 - 2 kg N ha-1 which is in the rangeof the measurement accuracy of commonly used measurement methods.

AB - 14th Ramiran International Conference, Lisboa 12-15th September 2010860237-Modelling ammonia emissions after field application of biogas slurriesAndreas Pacholski, Dirk Gericke, Ni Kang, Quakernack Robert, Kage HenningChristian-Albrechts-University at Kiel, Institute of Crop Science and Plant Breeding,Agronomyand Crop Science, Kiel, GermanyIn Germany, the production of biogas from energy cropping systems has been in the focus of thenational bio-energy strategy for the reduction of greenhouse gas emissions since the year 20004.Their greenhouse gas saving benefit can be strongly decreased by other adverse environmentaleffects induced by biogas systems as greenhouse gas and ammonia emissions.Ammoniaemissions which are unavoidable as biogas slurries have to be re-transferred to the field as N-fertilizers, contribute indirectly to greenhouse gas emissions. In addition ammonia emissions arethe main source of eutrophicating and acidifying compounds deposited on natural and semi-natural ecosystems.There is thus an urgent need to quantify NH3 emissions from biogasproduction systems. For scenario and regionalisation simulations, model approaches for NH3emissions after field applications of biogas slurries are of particular interest.Model development was carried out on the basis of intensive ammonia loss field measurementscarried out in the years 2007-2009 in biogas cropping systems grown in Northern Germany.Altogether 18 experimental campaigns including the simultaneous measurement of severalanimal and biogas slurries were carried out in multiple plot field experiments using different N-fertilization levels. For the determination of NH3 emissions micrometeorological as well as plotbased measurement approaches were used and subsequently cross- checked.Several new dynamic and empirical model approaches were tested which can be applied for thecalculation of NH3 losses after field application of biogas and animal slurries to energy crops. Inaddition to the well known principles for calculation of ammonia losses based on temperature, pHand soil water relationships new algorithms were implemented to account for the effects of slurryincorporation, crop type, canopy structure and precipitation on NH3 emissions. Model resultsshowed a good agreement with measured data with respect to both simulated ammonia lossdynamics as well absolute final losses.As compared to validation data the models show aquantitative accuracy of cumulated NH3 losses in between 1 - 2 kg N ha-1 which is in the rangeof the measurement accuracy of commonly used measurement methods.

KW - Sustainability Science

KW - Ecosystems Research

M3 - Published abstract in conference proceedings

SN - 978-972-8669-47-8

BT - Treatment and use of organic residues in agriculture

A2 - Cordovil, Goncalo

A2 - Marques dos Santos Cordovil, Claudia S.C.

A2 - Fernandes, Rute

PB - ISA Press

T2 - 14th Ramiran International Conference - RAMIRAN 2010

Y2 - 12 September 2010 through 15 September 2010

ER -