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Biodigester effluent fertilizer quality (IRRI)
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====== Organic nitrogen ====== * This is measured by the '''Total Organic Nitrogen''', which does not account for inorganic forms of nitrogen like (NH4, NO3, NO2) * Urea, (NH2)2CO, urea is an example of organic nitrogen and it is produced in the body principally for nitrogen excretion. Urea contains about 88 percent of the N (nitrogen), up to 67 percent of the P (phosphorus) and up to 71 percent of the K (potassium) present in human excreta.<ref>Drangert, JO. Fighting the Urine Blindness to Provide more Sanitation Options. Water SA. Vol 24, No 2. April, 1998. [https://web.archive.org/web/20141222023233/http://www2.gtz.de:80/Dokumente/oe44/ecosan/en-fighting-urine-blindness-1998.pdf http://web.archive.org/web/20141222023233/http://www2.gtz.de:80/Dokumente/oe44/ecosan/en-fighting-urine-blindness-1998.pdf]</ref> When urea is applied to the soil it reacts with water to form ammonium within 2 to 3 days. If urea is soly applied to the surface of soil some volatilization of the ammonia will occur and this can be fairly drastic in summer months.<ref>M.L. Vitosh, Extension Specialist. N-P-K FERTILIZERS. Michigan State University Agricultural Extension Bulletin. [https://web.archive.org/web/20100612165241/http://www.canr.msu.edu/vanburen/e-896.htm http://web.archive.org/web/20100612165241/http://www.canr.msu.edu/vanburen/e-896.htm].</ref>
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