Op de boerderij. Waar is de stikstof?
Sieta van Keimpema van de Farmer Defense Force (FDF) laat boerderij zien en praat over stikstof, NH4 en NOx.
Zijn de koeien het probleem?
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![[MV] Fearless 피어리스 by Rolling Quartz 롤링쿼츠 (3rd Single)](https://sun9-41.userapi.com/DkglRdafDnSRUJfn85jNE_foUffupzOPrgrcew/iYevl1fKDLY.jpg)
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