2013 Annual Report
Soil samples were collected from four long-term no-till cropping systems differing in rotation length and crop diversity at the Area IV Soil Conservation District (SCD) Cooperative Research Farm and analyzed for a suite of soil quality indicators. Collected data will provide critical information for understanding the value of crop rotations to affect soil functions throughout the northern Great Plains. This region is undergoing an unprecedented transition in agricultural land use involving the transition of grassland to annual crops, and recent documentation of cropping patterns in the region suggests an increased prevalence of monoculture cropping. Understanding crop rotation contributions to long-term soil functional capacity is essential to ascertain the relative sustainability of cropping practices throughout this important agricultural region.
Soil samples from on-going biochar experiments throughout the U.S. were collected and analyzed for mycorrhizal root colonization, soil aggregation, total C and N, and glomalin. While biochar is speculated to improve nutrient retention, soil aggregation, and microbial activity, information is lacking regarding effects of biochar on soil properties and processes in temperate agroecosystems. Data gathered in this study will address this critical information need, and in turn, will provide science-based guidelines for the sustainable use of this soil amendment.
Schmer, M.R., Liebig, M.A., Hendrickson, J.R., Tanaka, D.L., Phillips, B.L. 2012. Growing season greenhouse gas flux from switchgrass in the northern Great Plains. Biomass and Bioenergy. 45:315-319.
Sainju, U.M., Stevens, W.B., Caesar, T., Liebig, M.A. 2012. Soil greenhouse gas emissions affected by irrigation, tillage, crop rotation, and nitrogen fertilization. Journal of Environmental Quality. 41:1774-1786.
Cavigelli, M.A., Del Grosso, S.J., Liebig, M.A., Snyder, C.S., Fixen, P.E., Venterea, R.T., Leytem, A.B., McLain, J.E., Watts, D.B. 2013. US agricultural nitrous oxide emissions: context, status, and trends. Frontiers in Ecology and the Environment. 10:537-546.
Post, W.M., Izaurralde, R.C., West, T.O., Liebig, M.A., King, A.W. 2012. Management opportunities to enhance terrestrial CO2 sinks. Frontiers in Ecology and the Environment. 10(10):554-561. DOI:10.1890/120065.
Venterea, R.T., Halvorson, A.D., Kitchen, N.R., Liebig, M.A., Cavigelli, M.A., Del Grosso, S.J., Motavalli, P.P., Nelson, K.A., Spokas, K.A., Singh, B.P., Stewart, C.E., Ranaivoson, A., Strock, J., Collins, H.P. 2012. Challenges and opportunities for mitigating nitrous oxide emissions from fertilized cropping systems. Frontiers in Ecology and the Environment. 10(10)562-570.
Del Grosso, S.J., White, J.W., Wilson, G., Vandenberg, B.C., Karlen, D.L., Follett, R.F., Johnson, J.M., Franzluebbers, A.J., Archer, D.W., Gollany, H.T., Liebig, M.A., Ascough II, J.C., Reyes-Fox, M.A., Starr, J.L., Barbour, N.W., Polumsky, R.W., Gutwein, M., James, D.E., Pellack, L.S. 2013. Introducing the GRACEnet/REAP data contribution, discovery and retrieval system. Journal of Environmental Quality. 42:1274-1280. DOI:10.2134/jeq2013.03.0097.
Halvorson, J.J., Gonzalez, J.M., Hagerman, A.E. 2013. Retention of tannin-C is associated with decreased soluble-N and increased cation exchange capacity in a broad range of soils. Soil Science Society of America Journal. 77:1199-1213.
Schmidt, M.A., Kreinberg, A.J., Gonzalez, J.M., Halvorson, J.J., French, E., Bollmann, A., Hagerman, A.E. 2013. Soil microbial communities respond differently to three chemically defined polyphenols. Plant Physiology and Biochemistry. 72:190-197. pii:S0981-9428(13)00088-0. DOI:10.1016/j.plaphy.2013.03.003.