Purpose Oilseed crops are expected to become an important feedstock for production of renewable jet fuel. The objective of this study is to determine the life cycle energy and greenhouse gas (GHG) emissions of several 2- and 3-year crop rotations with cereals and oilseeds in a low precipitation environment of the inland Pacific Northwest. The purpose is to ascertain whether cropping intensification could improve energy efficiency and reduce GHG emissions. Methods A life cycle assessment (LCA) was carried out to evaluate the fossil energy and carbon footprint of nine cropping systems characterized by different inputs applied to spring carinata [Brassica carinata (A.) Braun] and winter canola (B. napus L.) in rotation with wheat (Triticum aevistum L.) and other cereal crops. Grain yield and field activity data from cropping systems were acquired from a field experiment over a 5-year period. Gas emissions were measured weekly over 2 years using static chamber methodology and laboratory gas chromatography. Inputs for the LCA regarding fertilizers, machinery fuel use, and pesticides were from the field trials and literature for fuel use. −1 Results and discussion Emission results of winter wheat (WW) rotations are between 300 and 400 g CO eq. kg WW, in the
The International Journal of Life Cycle Assessment – Springer Journals
Published: Jun 4, 2018
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