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<br />POND 81 EC, Field <br /> <br /> <br />umhos/ <br />cm <br />400 <br />350 <br />X00 <br />250 <br />200 <br />1so <br />100 <br />50 <br />0 <br />,:;;~ ~r <br /> <br />~ MIN. <br />® MEAN <br />® MAx. <br /> <br />1987 1986 1985 1984 1983 <br />