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<br />~ umhos/ <br />cm <br /> <br />SPRING & POND 29 EC, Field <br />350 <br />300 <br />250 <br />200 <br />150 <br />100 <br />50 <br />0 <br />~ MIN. <br />^ MEAN <br />^ MAX. <br /> <br />198? 1986 1985 1984 1983 <br />