R
Ragan M. Callaway
Researcher at University of Montana
Publications - 310
Citations - 44979
Ragan M. Callaway is an academic researcher from University of Montana. The author has contributed to research in topics: Introduced species & Competition (biology). The author has an hindex of 95, co-authored 290 publications receiving 41012 citations. Previous affiliations of Ragan M. Callaway include National University of La Pampa.
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Journal ArticleDOI
Oxalate contributes to the resistance of Gaillardia grandiflora and Lupinus sericeus to a phytotoxin produced by Centaurea maculosa
Tiffany L. Weir,Harsh P. Bais,Valerie J. Stull,Ragan M. Callaway,Giles C. Thelen,Wendy M. Ridenour,Suresh Bhamidi,Frank R. Stermitz,Jorge M. Vivanco +8 more
TL;DR: Addition of exogenous oxalate to native grasses and Arabidopsis thaliana (L.) Heynh grown in vitro alleviated the phytotoxic effects of catechin, supporting the field experiments and suggesting that root-secreted oxalates may also act as a chemical facilitator for plant species that do not secrete the compound.
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Effects of Acer platanoides invasion on understory plant communities and tree regeneration in the northern Rocky Mountains
TL;DR: The results indicate that A. platanoides trees suppress most native species, including the regeneration of the natural canopy dominants, but facilitate conspecifics in their understories.
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Stem respiration of ponderosa pines grown in contrasting climates: implications for global climate change
TL;DR: Under predicted increases in temperature and aridity, potential increases in aboveground carbon gain due to enhanced photosynthetic rates may be partially offset by increases in maintenance respiration in large trees growing in CO2-enriched atmospheres.
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Phytotoxic Effects of (±)-Catechin In vitro, in Soil, and in the Field
TL;DR: It is demonstrated that (±)-catechin is highly dynamic in natural soils, but is phytotoxic well below natural concentrations measured in some soils and applied at low concentrations in the field, and there is substantial conditionality in the effects of the allelochemical.
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Long-term increased grain yield and soil fertility from intercropping
Xiao Fei Li,Zhi-Gang Wang,Xing Guo Bao,Jian Hao Sun,Si Cun Yang,Ping Wang,Cheng Bao Wang,Jin Pu Wu,Xin Ru Liu,Xiu Li Tian,Yu Wang,Jian Peng Li,Yan Wang,Hai Yong Xia,Pei Pei Mei,Xiao Feng Wang,Jian Hua Zhao,Rui Peng Yu,Wei-Ping Zhang,Zong Xian Che,Lin Guo Gui,Ragan M. Callaway,David Tilman,David Tilman,Long Li +24 more
TL;DR: This article found that grain yields in inter-cropped systems were on average 22% greater than in matched monocultures and had greater year-to-year stability, suggesting that inter-crop may increase soil fertility via observed increases in soil organic matter, total nitrogen and macroaggregates.