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Soil Fertility

Contact John Sawyer

(515) 294-7078

Links

Iowa State University Sites

Iowa State University Publications

University Newsletters

University Soil Fertility Sites

Conferences

Regional Committees

USDA-Agricultural Research Service

Agricultural Organizations

Agencies

Soil Test Laboratory Information

Soils

Commodity Prices

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Corn greenness response to swine manure (left) versus no manure (right). Photo © John E. Sawyer

Corn greenness response to swine manure (left) versus no manure (right). Photo © John E. Sawyer