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All Fields
((("north walnut creek" OR "walnut creek?" OR "keigley branch" OR "squaw creek" OR "long dick creek" OR "loop branch ditch" OR "indian creek" OR "south skunk river" OR "elk creek" OR "clear creek" OR saleh OR andrews OR jaynes OR cosby) AND ((watershed OR benchmark) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) AND iowa) OR (ars AND stewards)) NOT Mahantango
Remove constraint All Fields: ((("north walnut creek" OR "walnut creek?" OR "keigley branch" OR "squaw creek" OR "long dick creek" OR "loop branch ditch" OR "indian creek" OR "south skunk river" OR "elk creek" OR "clear creek" OR saleh OR andrews OR jaynes OR cosby) AND ((watershed OR benchmark) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) AND iowa) OR (ars AND stewards)) NOT Mahantango
Topic
nitrate nitrogen
Remove constraint Topic: nitrate nitrogen
Format
Article OR Electronic OR Journal
Remove constraint Format: Article <strong class='text-muted constraint-connector'>OR</strong> Electronic <strong class='text-muted constraint-connector'>OR</strong> Journal