Soil Test Interpretation Guide
soil Test Interpretation Horneck, Sullivan, Owen, and HartEC 1478 Revised July 2011ContentsNitrogen (N) ........................................ ................................2Phospho rus (P) ........................................ ...........................3Cations (K, Ca, and Mg) ........................................ ............4Sulfate-sulfur (SO4-S) ........................................ ................5Micronutrients (B, Zn, Cu, Mn, Fe, and Mo) .................5Chloride (Cl ) ........................................ ...............................7pH, lime requirement (LR) ........................................ .......7Sodium (Na) ........................................ ................................9Soluble salts.
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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