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U <br />PONQ 82 EC, Field <br />600 <br />500 <br />400 <br />~ umhos/ 300 <br />cm <br />200 <br />loo <br />0 <br /> <br />^ MIN. <br />^ MEAN <br />^ r1Ax. <br /> <br />1987 1986 1985 1984 1983 <br />