1. Attarzadeh, Mahmood, et al. "Improvement of Echinacea purpurea performance by integration of phosphorus with soil microorganisms under different irrigation regimes." Agricultural Water Management 221 (2019): 238-247.
https://doi.org/10.1016/j.agwat.2019.04.022

2. Pernot, Clémentine, Nelson Thiffault, and Annie DesRochers. "Influence of root system characteristics on black spruce seedling responses to limiting conditions." Plants 8.3 (2019): 70.
https://doi.org/10.3390/plants8030070

3. Toca, Andrei, et al. "Ecologically distinct pine species show differential root development after outplanting in response to nursery nutrient cultivation." Forest Ecology and Management 451 (2019): 117562.
https://doi.org/10.1016/j.foreco.2019.117562