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In the context of the Climate and Energy Outlook 2022 (KEV2022), projections for process emissions of greenhouse gases and air polluting compounds from agriculture (animal husbandry and arable farming) were made with the National Emission Model for Agriculture (NEMA). Based on expected developments, emissions to air from enteric fermentation, manure management and agricultural soils were calculated. Respective emissions of methane, nitrous oxide, carbon dioxide from calcareous fertilizers and urea, ammonia, nitrogen oxide, particulate matter and non-methane volatile organic compounds are determined for 2025 and 2030, with a look through towards 2035 and 2040. In het kader van de Klimaat- en Energieverkenning 2022 (KEV2022) zijn met het National Emission Model for Agriculture (NEMA) ramingen voor procesemissies van broeikasgassen en luchtverontreinigende stoffen vanuit de landbouw (veehouderij en akkerbouw) opgesteld. Hiertoe zijn op basis van de verwachte ontwikkelingen luchtemissies door pens- en darmfermentatie, mestmanagement en landbouwbodems berekend. De betreffende emissies van methaan, lachgas, koolstofdioxide door kalkmeststoffen en ureum, ammoniak, stikstofoxide, fijnstof en niet-methaan vluchtige organische stoffen zijn bepaald voor 2025 en 2030, met een doorkijk naar 2035 en 2040.

Processed manure can be an alternative source of nutrients for untreated manure and mineral fertilizers. Mineral concentrates (MCs) are derived from reversed osmosis of the liquid fraction of separated pig slurries. The emissions of ammonia (NH3) and nitrous oxide (N2O) from different (processed) manures and fertilizers were tested in an incubation experiment and a greenhouse experiment with grass as a test crop. Dry matter yields and nitrogen (N) uptake were also determined in the greenhouse experiment. Incorporation into the soil decreased on NH3 emission but increased N2O emission for all nitrogen products (mineral fertilizer, untreated slurry, MC, and solid fraction of separated slurry). Incorporation of both MC, slurries, and mineral fertilizers increased N2O emission in the incubation experiment. The lowest apparent N recovery (ANR) in the pot experiment with grass was obtained for incorporated pig slurry (30–39%) and surface-applied MC (33–38%), while the highest ANRs were obtained for liquid ammonium nitrate (45–53%) and acidified MC (43–55%). It is concluded that MCs have a similar N fertilizer value as mineral N fertilizers if NH3 emission is reduced by incorporation or acidification.