@ Karima, you may take help of SGR which is a simple soil greenhouse gas flux model. It consists of submodels of soil temperature, water and GHG fluxes. The US EPA P2 Greenhouse Gas calculator also appears to be very useful.

· Estimated N2O and CO2 Emissions as Influenced by Agricultural Practices in Canada

Authors : B. GrantW. N. SmithR. DesjardinsR. LemkeC. Li, Climatic Change August 2004, Volume 65, Issue 3, pp 315–332.

Climatic Change An Interdisciplinary, International Journal Devoted to the Description, Causes and Implications of Climatic Change ISSN: 0165-0009 (Print) 1573-1480 (Online)

The Denitrification-Decompostion (DNDC) model was used to estimate the impact of change in management practices on N2O emissions in seven major soil regions in Canada, for the period 1970 to 2029. Conversion of cultivated land to permanent grassland would result in the greatest reduction in N2O emissions, particularly in eastern Canada wherethe model estimated about 60% less N2O emissions for thisconversion. About 33% less N2O emissions were predicted for a changefrom conventional tillage to no-tillage in western Canada, however, a slight increase in N2O emissions was predicted for eastern Canada. GreaterN2O emissions in eastern Canada associated with the adoption of no-tillage were attributed to higher soil moisture causing denitrification, whereas the lower emissions in western Canada were attributed to less decomposition of soil organic matter in no-till versus conventional tilled soil. Elimination of summer fallow in a crop rotation resulted in a 9% decrease in N2O emissions, with substantial emissions occurringduring the wetter fallow years when N had accumulated. Increasing N-fertilizer application rates by 50% increased average emissions by 32%,while a 50% decrease of N-fertilizer application decreased emissions by16%. In general, a small increase in N2O emissions was predicted when N-fertilizer was applied in the fall rather than in the spring. Previous research on CO2 emissions with the CENTURY model (Smith et al.,2001) allowed the quantification of the combined change in N2O andCO2 emissions in CO2 equivalents for a wide range of managementpractices in the seven major soil regions in Canada. The management practices that have the greatest potential to reduce the combined N2O andCO2 emissions are conversion from conventional tillage to permanent grassland, reduced tillage, and reduction of summer fallow. The estimated net greenhouse gas (GHG) emission reduction when changing from cultivated land to permanent grassland ranged from 0.97 (Brown Chernozem) to 4.24 MgCO2 equiv. ha−1 y−1 (BlackChernozem) for the seven soil regions examined. When changing from conventional tillage to no-tillage the net GHG emission reduction ranged from 0.33 (Brown Chernozem) to 0.80 Mg CO2 equiv. ha−1 y−1 (Dark GrayLuvisol). Elimination of fallow in the crop rotation lead to an estimated net GHG emission reduction of 0.43 (Brown Chernozem) to 0.80 Mg CO2 equiv.ha−1 y−1 (Dark Brown Chernozem). The addition of 50% more or 50% less N-fertilizer both resulted in slight increases in combined CO2 and N2O emissions. There was a tradeoff in GHG flux with greaterN2O emissions and a comparable increase in carbon storage when 50% more N-fertilizer was added. The results from this work indicate that conversion of cultivated land to grassland, the conversion from conventional tillage to no-tillage, and the reduction of summerallow in crop rotations could substantially increase C sequestration and decrease net GHG emissions. Based on these results a simple scaling-up scenario to derive the possible impacts on Canada's Kyoto commitment has been calculated.

Dear, you can go through given link for some additional informations-https://www.researchgate.net/publication/226885740_Estimated_N2O_and_CO2_Emissions_as_Influenced_by_Agricultural_Practices_in_Canada

Thanks dear colleagues. Interesting works. I will study your propositions and return back for more details.

Dear Karima,

We have experience on the use of soil-crop models for GHG estimation under Mediterranean conditions, with different publications on the topic. Feel free to get in touch with me if you need some more specific help.

Dear Daniel and Karima

I am also interested in developing new type of models (eg. using neual network tools etc - maybe a mixed model). If you are interested in we can make a small group and discuss what we can do in skype. Please note that I am a beginner in modelling.

Karima, your work in 2004 (labelling work) inspired me alot and help me alot during my PhD.

It is very nice to have a contact with you.

Regards

Mehmet

Thanks Daniel for your sharing and your help. Sure, with pleasure, I will contact you for learning more.

Dear Mehmet,

I am very happy that my work helped you when you were phD student. I am interested about your proposition, with Daniel also, if he is ok and why not other researchers ... I worked on agricultural soils in my phD but after I more work on aquatic or marine sediment and do more modeling but not these type of models (for more details, you can see Karima Khalil ). Now, I am interested on soil modelling relating with N20, CO2 and climate change.

I am pleased to have your contact and I hope work together soon.

All the best,

Karima

Dear Mehmet,

It's a good idea to make a small group and discuss what we can do with Skype

They're next October the ISEM meeting; It can be interesting for you to meet ecological modelers

Best Regards,

Khalid

Thanks khalid. It can be a good opportunity to discuss with modellers.

See the conference website for more details:

https://www.elsevier.com/events/conferences/international-society-for-ecological-modelling-global-conference