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Crop Rotation Effects on Soil Quality at Three Northern Corn/Soybean Belt Locations

^a USDA-ARS, Natl. Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011-4420
^b North Central Tech. College, 1000 W. Campus Dr., Wausau, WI 54401
^c USDA-NRCS, 200 E. Northwood St. Suite 410, Greensboro, NC 27401
^d Dep. of Agric. Econ.
^e Dep. of Agron., Iowa State Univ., Ames, IA 50011-1070

View larger version (25K): [in a new window]   Fig. 1. Conceptual representation of the soil management assessment framework (SMAF).

View larger version (20K): [in a new window]   Fig. 2. Long-term crop rotation sites used for soil quality and economic assessments.