Joel and Linda Zwiefel are well-known in Northwest Iowa for their farming innovations. Located in rural Fenton, Palo Alto County, they strip-tilled continuous corn for over 10 years. They have seen increased yields, better water infiltration and reduced soil erosion with strip-till. Recently Joel switched to vertical tillage to coordinate with his planter. Joel says that the "vertical tillage tool works 1-1/2 inches maximum into soil depth to prepare for planting."
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