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<br />POND 85 EC,Field <br />~ umhos/ <br />cm <br /> <br />14 <br />12 <br />10 <br />8 <br />6 <br />4 <br />2 <br />0 <br />^ MIN. <br />® MEAN <br />^ rl,ax. <br />-_ <br />.. ' ~~~~" ~f""~~/~~~~+~f~wM'~~ ,~FI'^^l~aF r.fe.a L~ ~v~i^_'.. <br />1987 1986 19$5 1984 1983 <br />