Evaluation of Soil. Loss after 100 Years of Soil and Crop Management
1991
Gantzer, C. J. | Anderson, S. H. | Thompson, A. L. | Brown, J. R.
Sanborn Field, at the University of Missouri-Columbia was established in 1888 and is the oldest agricultural experiment field wesl of the Mississippi River. It provides an excellent opportunity to document how long-term crop rotations, and soil management influ ence soil erosion. Analyses of topsoil thickness are presented ta describe soil remaining after 100 yr of cropping in plots planted to continuous corn (Zea mays L.), to continuous timothy (Phleum pratense L.), and to a 6-yr rotation cropped sequentially to corn, oaf (Avena sativa L.), wheat (Triticum mstivum), clover (Trifolium pratense), timothy, and timothy. Topsoil thickness was significantly less for the continuous corn than the 6-yr rotation or timothy plots after 100 yr of cropping. Corn plots had only about 44%, and the rotation plots had only about 70% as much topsoil as did the timothy plots. The amount of clay in the plow layer was significantly higher in the corn plots compared to either the rotation or timothy plots suggesting that mixing of clay subsoil within the plow layer occurred in corn plots. Contribution of the Missouri Agric. Exp. Stn. J. no. 11 165, with support from the Missouri Agric. Exp. Stn. Res. Project no. 396.
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