Introducing cover crops as fallow replacement in the Northern Great Plains: II. Impact on following wheat crops

dc.contributor.authorBourgault, Maryse
dc.contributor.authorWyffels, Samuel A.
dc.contributor.authorDafoe, Julia M.
dc.contributor.authorLamb, Peggy F.
dc.contributor.authorBoss, Darrin L.
dc.description© The Author(s), 2021. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (, which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.en_US
dc.description.abstractCrop-livestock integration has demonstrated that cover crops can be terminated using livestock grazing with minimal negative impacts on soil health, however, provides little information on system-level approaches that mutually benefit soil health and both crop and livestock production. Therefore, the objective of this research was to examine the effects of cover crop mixtures on biomass production, quality and the potential for nitrate toxicity on a dryland wheat-cover crop rotation. This research was conducted at the Montana State University-Northern Agricultural Research Center near Havre, MT (48°29′N, −109°48′W) from 2012 to 2019. This experiment was conducted as a randomized-complete-block design, where 29 individual species were utilized in 15 different cover crop mixtures in a wheat-cover crop rotation. Cover crop mixtures were classified into four treatment groups, including (1) cool-season species, (2) warm-season species dominant, (3) cool and warm-season species mixture (mid-season), and (4) a barley (Hordeum vulgare) control. All cover crop mixtures were terminated at anthesis of cool-season cereal species to avoid volunteer cereal grains in the following wheat crop. At the time of cover crop termination, dry matter forage production was estimated and analyzed for crude protein, total digestible nutrients and nitrates as indicators of forage quality. All mixtures containing oats (Avena sativa) had greater (P ⩽ 0.03) biomass production than other mixtures within their respective treatment groups (cool- and mid-season). Forage biomass was influenced by cover crop treatment group, with the barley producing the greatest (P < 0.01) amount of forage biomass when compared to cool-, mid- and warm-season cover crop treatments. Total digestible nutrients were greater (P < 0.01) in the barley control compared to the cool- and mid-season treatment groups. Crude protein was greatest in the warm-season treatment group (P < 0.01) compared to the barley control, cool- and mid-season treatment groups. The barley control produced fewer nitrates (P ⩽ 0.05) than the cool-, mid- and warm-season treatment groups; however, all cover crop mixtures produced nitrates at levels unsafe for livestock consumption at least one year of the study. The relatively high and variable nitrate levels of all cover crop mixtures across years in this study suggest that forage should be tested for nitrates before grazing. In conclusion, our research suggests that in a dryland wheat-cover crop rotation that requires early-July termination, cool-season cover crop mixtures are the most suitable forage source for livestock grazing most years.en_US
dc.identifier.citationBourgault, M., Wyffels, S., Dafoe, J., Lamb, P., & Boss, D. (2022). Introducing cover crops as fallow replacement in the Northern Great Plains: II. Impact on following wheat crops. Renewable Agriculture and Food Systems, 37(4), 303-312. doi:10.1017/S1742170521000508en_US
dc.publisherCambridge University Pressen_US
dc.subjectconservation agricultureen_US
dc.subjectcontinuous croppingen_US
dc.subjectcrop-livestock integrationen_US
dc.subjectcropping systemsen_US
dc.subjectsemi-arid environmentsen_US
dc.titleIntroducing cover crops as fallow replacement in the Northern Great Plains: II. Impact on following wheat cropsen_US
mus.citation.journaltitleRenewable Agriculture and Food Systemsen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentResearch Centers.en_US
mus.relation.universityMontana State University - Bozemanen_US


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