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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
Topic
Zea mays
Remove constraint Topic: Zea mays
Topic
nitrogen fertilizers
Remove constraint Topic: nitrogen fertilizers
Topic
crop models
Remove constraint Topic: crop models
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