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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.
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.
G. Zhang, “Honey bee nutritional health in agricultural landscapes: Relationships to pollen and habitat diversity”, Iowa State University, Ames, 2020.PDF icon honey_bee_nutritional_health_in_agricultural_landscapes.pdf (3.52 MB)