Abstract
Camelina (Camelina sativa L. Crantz), as a bioenergy and bio-product feedstock, may be grown as a rotation crop in the wheat-based cropping system to increase land use efficiency in the Northern Great Plains (NGP). In this study, which was conducted from 2008 to 2011 in central Montana, we evaluated the energy balance of three 2-year cop rotational sequences that included camelina-winter wheat (Triticum aestivum L.) (CAM-WW) and barley (Hordeum vulgare L.)-winter wheat (BAR-WW) compared with a traditional fallow-winter wheat (FAL-WW) rotation. Results indicated that 52 and 57 % more energy input was invested in CAM-WW and BAR-WW compared to FAL-WW system (9182 MJ ha−1), respectively. In all rotations, nitrogen fertilizer was the most energy-consuming input and accounted for 76, 68, and 69 % of the total energy used in wheat, barley, and camelina production, respectively. Averaged over 3 years, CAM-WW and BAR-WW systems yielded 34 and 29 % greater gross energy output compared with FAL-WW. The CAM-WW and BAR-WW also outperformed FAL-WW by 30 and 6 % in terms of net energy output. No significant differences in energy efficiency were found between the FAL-WW and CAM-WW systems. Taking into account of the greater net energy as well as similar values of energy use efficiency, the CAM-WW system performed better than the traditional FAL-WW system under rainfed conditions in central Montana. There is a good potential to improve the energy efficiency of the CAM-WW cropping system (by more than 26 %) through refinement of agronomic practices, mainly nitrogen fertilization and herbicide application, which can further enhance the sustainability of camelina feedstock production.
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Abbreviations
- CAM-WW:
-
Camelina-winter wheat
- BAR-WW:
-
Barley-winter wheat
- FAL-WW:
-
Fallow-winter wheat
- NGP:
-
Northern Great Plains
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Acknowledgments
The authors like to thank Karnes Neill, Johnna Heser, and Kelly Arnold for the technical support in the field and laboratory. The funding support of this project came from USDA Western Sustainable Research and Education grant, No. 080019002; Montana Agricultural Experiment Station; and USDA-NIFA BRDI grant, No. 2012-10006-20230.
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We declare that:
- The data presented in this paper is original and have not been manipulated
- The manuscript has not been submitted to more than one journal for simultaneous consideration
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- The manuscript has been approved by all the authors and consent to submit has been received explicitly from all co-authors, as well as from the responsible authorities
- Authors whose names appear on the submission have contributed sufficiently to the scientific work
- Chengci Chen, and Reza Keshavarz-Afshar declare that they have no conflict of interest (financial or non-financial).
- This article does not contain any studies with human or animal subjects.
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Keshavarz-Afshar, R., Chen, C. Intensification of Dryland Cropping Systems for Bio-feedstock Production: Energy Analysis of Camelina. Bioenerg. Res. 8, 1877–1884 (2015). https://doi.org/10.1007/s12155-015-9644-8
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DOI: https://doi.org/10.1007/s12155-015-9644-8