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Hanmin Mar 19, 2019 07:58 AM
Dear EEA,
I am very interested in ammonia emission factors. And in EMEP/EEA air pollutant emission inventory guidebook 2016, there are many sectors in the 'Inorganic N-fertilizers' category. I know that many things were used to calculate the emission factors, and I think the application rate of fertilizers was considered to make emission factors of inorganic N-fertilizers. How do you get the application rate data? Using the sales volume or survey? And how do you solve the problem that the variety properties of fertilizers(ex. different N, P, K rate by fertilizers...)?
Replies (2)
EEA Mar 27, 2019 09:48 AM
Dear 'Hanmin',

Thank you for contacting the European Environment Agency (EEA).
Your enquiry has been forwarded to our relevant experts. We will get back to you as soon as possible.

Thank you for your patience.

With kind regards,
EEA Enquiry Service
EEA Apr 17, 2019 07:36 AM
Dear 'Hanmin',

Thank you very much for your patience.
Please find below the answers to your questions:

- How are emission factors calculated?
This is a multi-stage process. Firstly, the EEA and its partners collated data from reports of measurements of ammonia emission from fertiliser. This collation was global and included reports from the last 40 years. A range of data were collated and these can be classified into the following groups; fertiliser type (e.g. urea, ammonium nitrate), measurement method and location (outdoor, laboratory), weather conditions, soil conditions. From these data, the EEA and its partners constructed a statistical model. The model was then used to calculate emission factors. To do this, one needed to specify the model inputs. The inputs concerning weather and soil conditions were (and remain) problematic, as there are no statistics at the European scale concerning agricultural practices relating to fertiliser. We therefore had to make assumptions, based on expert judgement.

- How did we get the application rate data ?
The current methodology does not require the rate of application to be specified, so it is sufficient to obtain the consumption data. The most reliable source of consumption data is the International Fertilizer Industry Association (IFA) database (http://ifadata.fertilizer.org/ucSearch.aspx).

- How did we solve the problem of the varied properties of the different fertilisers (eg. Different N, P, K rate)?
As noted above, the current methodology does not require the rate of application (i.e. kg N per hectare), only the total application (kt N per country). Note that the P and K content is only needed to identify the type of fertiliser used; the application of these elements is not included in the methodology.

We hope that this information will be useful for you.

With kind regards,
EEA Enquiry Service