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Biodigester effluent fertilizer quality (IRRI)
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====== Nitrite, NO2 ====== Nitrite is not bio available, but must be converted into nitrate for use by plants. Small concentrations of nitrite can be toxic to plants, but nitrite is an important intermediate in the conversion of ammonium to nitrate in the soil. Nitrite is also formed by dentrification, or the bacterial reduction of nitrate to nitrite, this occurs under anoxic (or oxygen deprived) conditions. Nitrite is not a stable intermediate and very few cases of nitrite accumulation have been reported. The levels of nitrite usually do not exceed 0.25 to 70 ppm within soil. Accumulation however can occur in neutral or alkaline soils, since the conversion from nitrite to nitrate is inhibited more than the conversion of ammonia to nitrite.<ref>O. L. OKE. Nitrite Toxicity to Plants. Nature Vol. 212, 528. Oct. 29,1966.</ref> Also bacteria present in sewage sludge converts nitrates into nitrites.<ref>Mollison, Bill. Permaculture: A Designer's Manual. Tagari, 1988. Pg 576.</ref>
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