Amossé, C., Jeuffroy, M.H., and David, C.
2013. Relay intercropping of legume cover crops in organic winter wheat: Effects on performance and resource availability. Field Crops Research
145:78–87.
Amossé, C., Jeuffroy, M.H., Mary, B., and David, C.
2014. Contribution of relay intercropping with legume cover crops on nitrogen dynamics in organic grain systems. Nutrient Cycling in Agroecosystems
98:1–14.
Anderson, R.L.
2015. Suppressing weed growth after wheat harvest with underseeded red clover in organic farming. Renewable Agriculture and Food Systems
31:185–190.
Badaruddin, M. and Meyer, D.W.
1989. Water use by legumes and its effect on soil water status. Crop Science
29:2012–2016.
Bergkvist, G.
2003. Perennial clovers and ryegrass as understory crops in cereals. PhD dissertation, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Black, A.D., Laidlaw, A.S., Moot, D.J., and O'Kiely, P.
2009. Comparative growth and management of white and red clovers. Irish Journal of Agricultural and Food Research
48:149–166.
Blackshaw, R.E., Molnar, L.J., and Moyer, J.R.
2010. Suitability of legume cover crop-winter wheat intercrops on the semi-arid Canadian prairies. Canadian Journal of Plant Science
90:479–488.
Blaser, B.C., Gibson, L.R., Singer, J.W., and Jannink, J.L.
2006. Optimizing seeding rates for winter cereal grains and frost-seeded red clover intercrops. Agronomy Journal
98:1041–1049.
Blaser, B.C., Singer, J.W., and Gibson, L.R.
2011. Winter cereal canopy effect on cereal and interseeded legume productivity. Agronomy Journal
103:1180–1185.
Brakke, M.K.
1987. Virus diseases of wheat. Wheat and Wheat Improvement
13:585–624.
Brust, J., Claupein, W., and Gerhards, R.
2014. Growth and weed suppression ability of common and new cover crops in Germany. Crop Protection
63:1–8.
Carlsson, G. and Huss-Danell, K.
2003. Nitrogen fixation in perennial forage legumes in the field. Plant and Soil
253:353–372.
Carr, P.M., Mäder, P., Creamer, N.G., and Beeby, J.S.
2012. Editorial: Overview and comparison of conservation tillage practices and organic farming in Europe and North America. Renewable Agriculture and Food Systems
27:2–6.
Cherr, C.M., Scholberg, J.M.S., and McSorley, R.
2006. Green manure approaches to crop production. Agronomy Journal
98:302–319.
Cicek, H., Entz, M.H., Thiessen Martens, J.R., and Bullock, P.R.
2014. Productivity and nitrogen benefits of late-season legume cover crops in organic wheat production. Canadian Journal of Plant Science
94:771–783.
Den Hollander, N.G., Bastiaans, L., and Kropff, M.J.
2007. Clover as a cover crop for weed suppression in an intercropping design: II. Competitive ability of several clover species. European Journal of Agronomy
26:104–112.
Drangmeister, H.
2003. Tipps für einen erfolgreichen Kleegrasanbau im Ӧko-Landbau. In German. Bundesministerium für Verbraucherschutz, Ernährung und Landwirtschaft.
Drinkwater, L.E., Letourneau, D.K., Workneh, F., Van Bruggen, A.H.C., and Shennan, C.
1995. Fundamental differences between conventional and organic tomato agroecosystems in California. Ecological Applications
5:1098–1112.
Gentry, L.E., Snapp, S.S., Price, R.F., and Gentry, L.F.
2013. Apparent red clover nitrogen credit to corn: Evaluating cover crop introduction. Agronomy Journal
105:1658–1664.
Hartwig, N.L. and Ammon, H.U.
2002. Cover crops and living mulches. Weed Science
50:688–699.
Mallory, E.B. and Darby, H.
2013. In-season nitrogen effects on organic hard red winter wheat yield and quality. Agronomy Journal
105:1167–1175.
Miller, P.R., Lighthiser, E.J., Jones, C.A., Holmes, J.A., Rick, T.L., and Wraith, J.M.
2011. Pea green manure management affects organic winter wheat yield and quality in semiarid Montana. Canadian Journal of Plant Science
91:497–508.
Mutch, D.R., Martin, T.E., and Kosola, K.R.
2003. Red clover (Trifolium pratense) suppression of common ragweed (Ambrosia artemisiifolia) in winter wheat (Triticum aestivum). Weed Technology
17:181–185.
Parr, M., Grossman, J.M., Reberg-Horton, S.C., Brinton, C., and Crozier, C.
2011. Nitrogen delivery from legume cover crops in no-till organic corn production. Agronomy Journal
103:1578–1590.
Peoples, M.B. and Baldock, J.A.
2001. Nitrogen dynamics of pastures: Nitrogen fixation inputs, the impact of legumes on soil nitrogen fertility, and the contributions of fixed nitrogen to Australian farming systems. Animal Production Science
41:327–346.
Peoples, M.B., Brockwell, J., Herridge, D.F., Rochester, I.J., Alves, B.J.R., Urquiaga, S., Boddey, R.M., Dakora, F.D., Bhattarai, S., Maskey, S.L., and Sampet, C.
2009. The contributions of nitrogen-fixing crop legumes to the productivity of agricultural systems. Symbiosis
48:1–17.
Pimentel, D., Hepperly, P., Hanson, J., Douds, D., and Seidel, R.
2005. Environmental, energetic, and economic comparisons of organic and conventional farming systems. BioScience
55:573–582.
Robinson, C. and Nielsen, D.
2015. The water conundrum of planting cover crops in the Great Plains: When is an inch not an inch?
Crops Soils
48:24–31.
Ross, S.M., King, J.R., Izaurralde, R.C., and O'Donovan, J.T.
2001. Weed suppression by seven clover species. Agronomy Journal
93:820–827.
SAS Institute. 2014. User's Guide: Statistics. SAS Inst., Cary, NC.
Schipanski, M.E. and Drinkwater, L.E.
2011. Nitrogen fixation of red clover interseeded with winter cereals across a management-induced fertility gradient. Nutrient Cycling in Agroecosystems
90:105–119.
Snapp, S.S., Swinton, S.M., Labarta, R., Mutch, D., Black, J.R., Leep, R., and O'Neil, K.
2005. Evaluating cover crops for benefits, costs and performance within cropping system niches. Agronomy Journal
97:322–332.
Stute, J.K. and Posner, J.L.
1993. Legume cover crop options for grain rotations in Wisconsin. Agronomy Journal
85:1128–1132.
Triplett, G.B. Jr and Dick, W.A.
2008. No-tillage crop production: A revolution in agriculture!
Agronomy Journal
100:S-153–S-165.
Wortman, S.E., Francis, C.A., Galusha, T.D., Hoagland, C., Van Wart, J., Baenziger, P.S., Hoegemeyer, T., and Johnson, M.
2013. Evaluating cultivars for organic farming: Maize, soybean, and wheat genotype by system interactions in Eastern Nebraska. Agroecology and Sustainable Food Systems
37:915–932.