Research ArticleOpen accessIn the abstractReducing Ammonia Loss from Urea by Mixing with Humic and Fulvic Acids Isolated from CoalAmeera Abdul Reeza, Osumanu Haruna Ahmed, Nik Muhamad Nik Ab. Majid, Mohamadu Boyie JallohAmerican Journal of Environmental Sciences, Vol. 5, Issue 3 · 30 Jun 2009 · 10,904 accessesView PDFCite