Publications

J. Iqbal, Parkin, T. B., Helmers, M. J., Zhou, X., and Castellano, M. J., “Denitrification and Nitrous Oxide Emissions in Annual Croplands, Perennial Grass Buffers, and Restored Perennial Grasslands”, Soil Science Society of America Journal, vol. 79, 2015. 2014 Iqbal et al. SSSAJ.pdf (799.51 KB)

B. Chen, Krajewski, W. F., Zhou, X., and Helmers, M. J., “Organized variability of surface runoff responses across neighboring hillslopes in Iowa”, Journal of Hydrology, vol. 523, pp. 1-13, 2015.

D. C. Mitchell, Zhou, X., Parkin, T. B., Helmers, M. J., and Castellano, M. J., “Comparing Nitrate Sink Strength in Perennial Filter Strips at Toeslopes of Cropland Watersheds”, Journal of Environmental Quality, 2014. 2014 Mitchell et al. JEQ.pdf (878.38 KB)

T. E. Smith, Kolka, R. K., Zhou, X., Helmers, M. J., Cruse, R. M., and Tomer, M. D., “Effects of native perennial vegetation buffer strips on dissolved organic carbon in surface runoff from an agricultural landscape”, Biogeochemistry, vol. 120, pp. 121-132, 2014.

X. Zhou, Helmers, M. J., Asbjornsen, H., Kolka, R., Tomer, M. D., and Cruse, R. M., “Nutrient removal by prairie filter strips in agricultural landscapes”, Journal of Soil and Water Conservation, vol. 69, pp. 54-64, 2014.

V. Hernandez-Santana, Zhou, X., Helmers, M. J., Asbjornsen, H., Kolka, R., and Tomer, M., “Native prairie filter strips reduce runoff from hillslopes under annual row-crop systems in Iowa, USA”, Journal of HydrologyJournal of Hydrology, vol. 477, pp. 94-103, 2013.

M. J. Helmers, Zhou, X., Asbjornsen, H., Kolka, R., Tomer, M. D., and Cruse, R. M., “Sediment removal by prairie filter strips in row-cropped ephemeral watersheds”, Journal of environmental quality, vol. 41, pp. 1531-1539, 2012.

D. R. Lockett, Zhou, X., and Helmers, M. J., “Impacts of Incorporating Prairie Vegetation within Row Crop Production on Soil Hydraulic Properties”, 2011 Louisville, Kentucky, August 7-10, 2011. American Society of Agricultural and Biological Engineers, p. 1, 2011.

M. J. Helmers, Zhou, X., Asbjornsen, H., and Kolka, R., “Water quality benefits of perennial filter strips in row-cropped watersheds”, 2011.

X. Zhou, Helmers, M. J., Asbjornsen, H., Kolka, R., and Tomer, M. D., “Perennial filter strips reduce nitrate levels in soil and shallow groundwater after grassland-to-cropland conversion”, Journal of environmental quality, vol. 39, pp. 2006-2015, 2010.