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cite-note-2626. ↑ citerefglibertharrisonheilseitzinger2006Glibert P, Harrison J, Heil C, Seitzinger S (2006). "Escalating worldwide use of urea – a global change contributing to coastal eutrophication". Biogeochemistry. 77 (3): 441–463. Bibcode:2006Biogc..77..441G. doi:10.1007/s10533-005-3070-5. S2CID 2209850.

cite-note-2727. ↑ citerefdaighsavinbryenorman2014Daigh AL, Savin MC, Brye K, Norman R, Miller D (2014). "Urea persistence in floodwater and soil used for flooded rice production". Soil Use and Management. 30 (4): 463–470. Bibcode:2014SUMan..30..463D. doi:10.1111/sum.12142. S2CID 97961385.

cite-note-2828. ↑ citerefmarshsimsmulvaney2005Marsh KL, Sims GK, Mulvaney RL (November 2005). "Availability of urea to autotrophic ammonia-oxidizing bacteria as related to the fate of 14 C-and 15 N-labeled urea added to soil". Biology and Fertility of Soils. 42 (2): 137–145. doi:10.1007/s00374-005-0004-2. S2CID 6245255.

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