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((("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
Format
Electronic
Remove constraint Format: Electronic
Topic
losses from soil
Remove constraint Topic: losses from soil
Topic
nitrate nitrogen
Remove constraint Topic: nitrate nitrogen
Topic
AgSpace
Remove constraint Topic: AgSpace
Topic
Zea mays
Remove constraint Topic: Zea mays
Format
Article OR Electronic
Remove constraint Format: Article <strong class='text-muted constraint-connector'>OR</strong> Electronic