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62 Ippolito, J. A., Bjorneberg, D., Stott, D., and Karlen, D. (2017). Soil quality improvement through conversion to sprinkler irrigation. Soil Science Society of America Journal 81, 1505–1516. doi:10.2136/sssaj2017.03.0082

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66 Karlen, D. L., Hunt, P. G., and Campbell, R. B. (1984). Crop residue removal effects on com yield and fertility of a Norfolk sandy loam. Soil Science Society of America Journal 48, 868–872.

67 Karlen, D. L., Erbach, D. C., Kaspar, T. C., Colvin, T. S., Berry, E. C., and Timmons, D. R. (1990). Soil tilth: A review of past perceptions and future needs. Soil Science Society of America Journal 54, 153–161.

68 Karlen, D. L., Wollenhaupt, N. C., Erbach, D. C., Berry, E. C., Swan, J. B., Eash, N. S., and Jordahl, J. L. (1994a). Crop residue effects on soil quality following 10‐years of no‐till corn. Soil and Tillage Research 31, 149–167.

69 Karlen, D. L., Wollenhaupt, N. C., Erbach, D. C., Berry, E. C., Swan, J. B., Eash, N. S., and Jordahl, J. L. (1994b). Long‐term tillage effects on soil quality. Soil and Tillage Research 32, 313–327.

70 Karlen, D. L., Parkin, T. B., and Eash, N. S. (1996). Use of soil quality indicators to evaluate Conservation Reserve Program sites in Iowa. In J. W. Doran and A. J. Jones (Eds.) Methods for assessing soil quality (pp. 345–355). Soil Science Society of America Special Publication No. 49. Madison, WI: SSSA.

71 Karlen, D. L., Mausbach, M. J., Doran, J. W., Cline, R. G., Harris, R. F., and Schuman, G. E. (1997). Soil quality: A concept, definition, and framework for evaluation. Soil Science Society America Journal 61, 4–10.

72 Karlen, D. L., Gardner, J. C., and Rosek, M. J. (1998). A soil quality framework for evaluating the impact of CRP. Journal Production Agriculture 11, 56–60.

73 Karlen, D. L., Andrews, S. S., and Doran, J. W. (2001). Soil quality: Current concepts and applications. Advances in Agronomy 74, 1–40.

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75 Karlen, D. L., Andrews, S. S., Wienhold, B. J., and Doran, J. W. (2003b). Soil quality: Humankind’s foundation for survival. Journal of Soil Water Conservation 58, 171–179.

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77 Karlen, D. L., Stott, D. E., Cambardella, C. A., Kremer, R. J., King, K. W., and McCarty, G. W. (2014b). Surface soil quality in five Midwest cropland CEAP watersheds. Journal Soil Water Conservation 69, 393–401.

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80 Klingebiel, A. A., and O'Neal, A. M. (1952). Structure and its influence on tilth of soils. Soil Science Society of America Journal 16, 77–80.

81 Knops, J. M. H., and Tilman, D. (2000). Dynamics of soil nitrogen and carbon accumulation for 61 years after agricultural abandonment. Ecology 81, 88–98.

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83 Laird, D. A., Fleming, P. D., Davis, D. D., Horton, R., Wang, B., and Karlen, D. L. (2010). Impact of biochar amendments on the quality of a typical Midwestern agricultural soil. Geoderma 158, 443–449.

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