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u <br /> <br /> <br />umhos/ <br />cm <br />SPRING & POND 20 EC, Field <br />700 <br />600 <br />500 <br />400 <br />300 <br />200 <br />100 <br />0 <br />~ MIN. <br />~ MEAN <br />^ MAX. <br />;,,:.. ., <br />1987 1986 1985 1984 1983 <br />