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Biodigester effluent fertilizer quality (IRRI)
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===== Sodium, Na ===== High concentrations of sodium ions found in waste water and used to irrigate agricultural areas reduce the infiltration rate and permeability of soils. When these soils dry a crust forms creating problems for tillage and interfering with germination and seedling emergence. These effects are dependent on the sodium ion concentration relative to the concentration of calcium and magnesium ions and the total salt concentration. Since the total salt concentrations in sewage effluent can be several hundred mg/l higher than in drinking water, total salt is an important indicator of the quality of fertilizers and irrigation waters from sewage.<ref>Food and Agriculture Organization of the United Nations, FAO. Wastewater quality guidelines for agricultural use. http://www.fao.org/docrep/t0551e/t0551e04.htm#2.3 effluent quality guidelines for health protection</ref> SAR, Sodium adsorption ratio.
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