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https://doi.org/10.1016/j.envexpbot.2018.06.023
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https://doi.org/10.1111/nph.15542
https://doi.org/10.1016/j.envexpbot.2018.06.023
Gray, Sharon B., et al. "Minirhizotron imaging reveals that nodulation of field-grown soybean is enhanced by free-air CO2 enrichment only when combined with drought stress." Functional Plant Biology 40.2 (2013): 137-147.
https://doi.org/10.1071/FP12044
Kou, Liang, et al. "Unaltered phenology but increased production of ectomycorrhizal roots of Pinus elliottii under 4 years of nitrogen addition." New Phytologist 221.4 (2019): 2228-2238.
https://doi.org/10.1111/nph.15542