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<br />POND 18-4 EC, FIELD <br />~ umhos/ <br />cm <br />450 <br />400 <br />350 <br />300 <br />250 <br />200 <br />1so <br />100 <br />50 <br />0 <br />^ MIN. <br />^ MEAN <br />^ r1Ax. <br /> <br />._ r -_~ s <br />~rna7rf!:,._..s±s-:,t:~.~:~,#W,r~;ia,~d tic.s~,:..~ 2~:s.`~?^'~s3... ., ,,.~t,~w = <br />198 1986 1985 1984 1983 <br />