Soil Test Interpretation Guide
Ammonium-nitrogen usually does not accu-mulate in the soil, as soil temperature and moisture conditions suitable for plant growth also are ideal for conversion of NH 4-N to NO 3-N. Ammonium-nitrogen concentrations of 2–10 ppm are typical. Soil NH 4-N levels above 10 ppm may occur in cold or extremely wet soils, when the soil contains
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