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Fig. 3. Testing of the model for barley, maize, and sorghum. The data for spring barley are from Pullman, WA (Huggins, unpublished) and from Bulman and Smith (1993b) in an experiment in Canada; their data is the average of three cultivars. Data from Delogu et al. (1998) are for winter barley growing at three nitrogen (N) fertilization rates (0, 80, and 140 kg N ha–1); each point is the average of 2 yr. Data for maize are from Bodley (2004) and Derby et al. (2005) for maize grown at different N fertilization rates in Pullman, WA and Oakes, ND, respectively. Data from Mehdi et al. (1999) correspond to 2 yr and different tillage practices. The data for sorghum from Kamoshita et al. (1998b) are from three hybrids grown at 0 and 240 kg N ha–1, and data from Traore and Maranville (1999) are for different genotypes adapted to the experimental area (Nebraska) or adapted to tropical growing conditions.
