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<br />SPRING & POND 17 EC, Field <br /> <br /> <br />umhos/ <br />cm <br />800 <br />700 <br />600 <br />500 <br />400 <br />300 <br />200 <br />104 <br />0 <br /> <br />~ MIN. <br />~ MEAN <br />^ MAx. <br />,..~.- ..::: F <br />1987 1986 1985 1984 1983 <br />