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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
AgSpace
Remove constraint Topic: AgSpace
Topic
Zea mays
Remove constraint Topic: Zea mays
Topic
fertilizer rates
Remove constraint Topic: fertilizer rates
Topic
Root Zone Water Quality Model
Remove constraint Topic: Root Zone Water Quality Model
Topic
corn
Remove constraint Topic: corn
Format
Electronic
Remove constraint Format: Electronic