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<br />POND 89 EC, Field <br />n <br /> <br />umhos/ <br />cm <br />800 <br />700 <br />600 <br />500 <br />400 <br />300 <br />200 <br />100 <br />0 <br />^ MIN. <br />® MEAN <br />® MAX. <br />"n~...~ ~ 5 a J 1..f.: .~ <d..~.t ~. .1 ~.:.. r -avalQr~7a`. .',Na .. , _. ~ . ' + u. .. 1'.. <br />1987 1986 1985 1984 1983 <br />