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    Triplett-Van Doren Long-term Tillage and Crop Rotation Data (1962-2012)
    (Ohio State University. Ohio Agricultural Research and Development Center, 2013) Dick, Warren A.; Triplett, Glover B.; Van Doren, David M.
    Experiments on the effects of tillage and rotation on crop yields were started in 1962 near Wooster, Ohio, USA and in 1963 near Hoytville, Ohio, USA by Drs. David M. Van Doren and Glover B. Triplett. These sites present the longest continually maintained no-tillage research plots to date. The original research objective was to determine the amount of tillage needed to maintain satisfactory yields of corn (Zea mays L.) and to determine the interaction of crop rotation, tillage and soil type with respect to corn yields. Tillage systems are (1) no-tillage where the residue from previous years' crops are left on the field and a single slot opening is used during planting; (2) minimum tillage using a paraplow (1962-1983) and a chisel plow (1984-present) to loosen the soil while leaving the majority of residues on the soil surface; and (3) plow tillage where a moldboard plow was used to invert the soil to a depth of about 20 cm, thus burying most of the residues. Crop rotations are (1) continuous corn; (2) corn and soybeans (Glycine max L.) in a 2-year rotation; and (3) corn, oat (Avena sativa L.) or hay, and hay in a 3-year rotation. With minor modifications over the years, these treatments have been continuously maintained since their beginning in 1962 and 1963.