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Title:   Author  item
                                            Allen, Brettitem
                                            LENSSEN, ANDREW - Iowa State Universityitem
                                            Sainju, Upendraitem
                                            Caesar, Thecanitem
                                            Evans, Robert
  Submitted to: Agronomy Journal
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 1/20/2014
                                    Publication  Date: 2/28/2014
                                    Publication URL: http://handle.nal.usda.gov/10113/58664Citation: Allen, B.L., Lenssen, A.W., Sainju, U.M., Caesar, T., Evans, R.G. 2014. Nitrogen use in durum and selected Brassicaceae oilseeds in two-year rotations. Agronomy Journal. 106(3):821-830.Interpretive Summary: Crucifer oilseeds can serve as potential feedstock for renewable biofuels to offset demand for petroleum-based alternatives. However, little is known about oilseed crops and N management in semi-arid cropping systems.  A 5-yr study in NE Montana indicated that N productivity was significantly related to seed yield in the three crucifer oilseeds (crambe, camelina, juncea canola) tested in rotation with durum and that juncea generally used N more efficiently than crambe and camelina. Similarly, N productivity was significantly related to grain yield in durum following oilseeds. Grain yield of durum following juncea was as great as that for durum following fallow and greater than that for durum following camelina or crambe. Durum following crambe tended to use N more inefficiently than durum following camelina, juncea, or fallow. Differences in yield and N use of durum and oilseeds varied significantly between years, however, underscoring the need to further develop management tools to optimize durum-oilseed cropping systems in highly variable rainfall environments.
                                Technical Abstract: Brassicaceae oilseeds can serve as potential feedstocks for renewable biofuels to offset demand for petroleum-based alternatives. However, little is known about oilseed crop yield potential and N use in semiarid, wheat (Triticum spp.)-based cropping systems that dominate the northern Great Plains (NGP). A 5-yr study was conducted in northeast Montana to investigate the yield potential of a direct seeded system of durum (T. durum Desf.) in rotation with either chemical fallow or three Brassicaceae oilseeds: camelina [Camelina sativa (L.) Crantz], crambe (Crambe abyssinica Hochst. ex R.E. Fries), and canola-quality Brassica juncea L. Overall, results from the study indicated that seed yield in the three Brassicaceae oilseeds tested in rotation with durum was related (P < 0.001; r2 = 0.68) to a nitrogen recovery index (NRI), indicating the importance of nitrogen use (NU) efficiency in dryland oilseed production, and that B. juncea generally used N more efficiently than crambe and camelina. Similarly, NRI was related (P < 0.001; r2 = 0.72) to grain yield in durum following oilseeds. Grain yield of durum following B. juncea was similar to durum following fallow and greater than durum following camelina or crambe. Durum following crambe tended to use N more inefficiently than durum following camelina, B. juncea, or fallow. Differences in yield and N use of durum and oilseeds varied among years, which underscores the need to further develop management tools to optimize durum-oilseed cropping systems in highly variable rainfall environments typical of the NGP.


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