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SALT • <br />0-2 No significant effect <br />2-4 Sensitive crops effected, beans and garden crops <br />4-B Many crops effected, except beets, alfalfa, grains <br />8-+ Most crops effected <br />Na - Sodium - An index of the exchangeable sodium in the soil <br />If Na/CEC is greater than .15 soil is classified as alkali. <br />Lime - Free lime tends to cause many soil nutrients to become <br />"fixed" and rendered substantially unavailable. <br />OM - Organic matter provides nitrogen and moisture holding <br />capacity. <br />OrgN - Organic nitrogen is the nitrogen calculated (lb/acre) <br />to be released by the OM during the growing season. <br />AVAILABLE NUTRIENTS - Reported in parts per million (all test <br />levels are available, total element is usually higher). <br />NO3 - Nitrate nitrogen. 1 ppm NO3 - N is equivalent to from 2 to <br />4 lb/acre N depending on crop and soil conditions. The NO3 - <br />N test is particularly important for crops such as sugar beets <br />and potatoes where regulation of the total N supply is critical. <br />NH4 - Ammonia nitrogen - Usually low as applied ammonia and • <br />ammonium fertilizer convert to N)3 - N. <br />P_ - Phosphorus - 1 ppm phosphorus is equivalent to 4.6 lb/acre <br />phosphoric acid (P205). Applied P205 becomes "fixed" <br />to a large degree and releases only a fraction each season, <br />therefore the soil test is not a measure of total previous <br />application but is a measure of the fraction currently <br />available. <br />K - Potassium - 1 ppm potassium is equivalent to 2.4 lb/acre <br />potash (K20) Potash requirement is determined by the <br />cation "balance" method according to the intended crop. <br />Ca b Mg - Calcium and Magnesium - Used primarily in calculating <br />CEC. For calcium and magnesium deficiency see "Lime". <br />S - Sulphur - This is the level of chemically combined sulfur <br />(SO4-S) in the soil. Recently applied elemental sulfur <br />is not included. <br />• <br />7-3-4 <br />