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Soil Test Interpretation Guide

soil Test Interpretation Horneck, Sullivan, Owen, and HartEC 1478 Revised July 2011 ContentsNitrogen (N) ..2 Phosphorus (P) ..3 Cations (K, Ca, and Mg) ..4 Sulfate-sulfur (SO4-S) ..5 Micronutrients (B, Zn, Cu, Mn, Fe, and Mo) ..5 Chloride (Cl ) ..7pH, lime requirement (LR) ..7 Sodium (Na) ..9 Soluble salts ..9 Organic matter or soil carbon ..9 Cation exchange capacity (CEC) ..10 For more information ..12 Regular soil testing is an important element in nutrient management. You can use soil tests as a diagnostic tool or to identify trends through time. To obtain meaningful test results, you must sample soil correctly, at the same time each year, and you must maintain more information, see the following in the OSU Extension Catalog ( ): soil Sampling for Home Gardens and Small Acreages (EC 628); Monitoring soil Nutrients Using a Management Unit Approach (PNW 570); Monitoring soil Nutrients in Dryland Systems Using Management Units (EM 8920).

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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