In Search of a Sustainable Cropping System for the Semiarid Canadian Prairies

By R. Zentner, C. Campbell, V. Biederbeck, Perry R. Miller, F. Selles, M. R. Fernández. 2001

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Grain Legumes in Northern Great Plains : Impacts on Selected Biological Soil Processes (2007, background): “In Saskatchewan, Zentner et al. (2001) reported 24% less total energy requirement in a lentilwheat rotation compared with a wheat-wheat system because lentil N reduced fertilizer-N requirements for subsequent wheat.”
Break crop benefits in temperate wheat production (2008, background): “Positive yield responses are notably less reliable and generally smaller in semi-arid areas (Gan et al., 2003; Zentner et al., 2001) or in drier seasons (Kirkegaard et al., 2001) and may be negative where break crops replace fallow (Miller and Holmes, 2005).”
Reconsidering Integrated Crop-Livestock Systems in North America (2007, background): “Building on the flex-cropping approach of Zentner et al. (2001) and the opportunity cropping concept of Peterson et al. (1993), Tanaka et al. (2002) suggested the use of a dynamic cropping system approach to achieve long-term goals.”