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Lori A Hoagland

Horticulture and Landscape Architecture 

  • Associate Professor of Horticulture
Horticulture Room 314

Area of Expertise: Microbial Ecology of Horticultural Systems


  • PhD, Soil Microbiology and Biochemistry, Washington State University
  • MS, Agroecology, University of Nebraska-Lincoln
  • BS, Environmental Science, University of Nebraska-Lincoln


Feeding the world's growing population while dealing with soil and water degradation, rapidly evolving pests and increasing climate instability will require innovative solutions. To address these challenges my lab studies soil microbial ecology and plant-microbial relationships. The soil microbial community regulates many key agroecosystem services including soil nutrient and heavy metal cycling, improving water infiltration and soil water-holding capacity, and keeping pest populations in check. Moreover, some soil microbes can form intimate associations with plants helping them acquire nutrients, withstand biotic and abiotic stress, and improve the yield, quality and safety of produce. Learning more about how to effectively mange soil and plant microbiomes has potential to increase farm profitability, improve human health and well-being, and reduce negative impacts of production systems on the environment. 

Specific goals of on-going projects include:

  • Biologically controlling plant and human enteric pathogens
  • Mitigating heavy metal and drought stress
  • Improving nitrogen-use efficiency
Many of our studies are conducted in collaboration with other scientists using a multidisciplinary research approach. Details for two of these projects can be found at the following websites:

Courses Taught:

  • HORT 20100 – Plant Propagation (2010-2014)
  • HORT 52500 – The Plant Microbiome (formerly HORT 49000 Rhizosphere Ecology) (2014-present)
  • SFS/HORT 31200 – Introduction to Urban Agriculture (2015-present)
  • SFS/HORT 49000 – Agroecosystem Analysis (new study abroad course in Colombia coming summer 2018)

Awards & Honors

(2015) Acorn Seed of Excellence Award. Purdue University.

(2015) Millionaire's Club Award.

(2011) International Travel Grant Award. Agriculture Research Program, Purdue University.

(2011) Acorn Seed of Excellence Award. Purdue University.

(2011) Millionaire’s Club Award. Purdue University.

Selected Publications

Ximenes, E. A., Hoagland, L. A., Ku, S., & Ladisch, M. R. (2017). Human pathogens in biofilms: formation, physiology and detection. Biotechnology and Bioengineering. doi:10.1002/bit.26247

Simon, P., Navazio, J., Colley, M., Hoagland, L. A., Roberts, P., DuToit, L., . . . McCluskey, C. (2017). The CIOA Project: Location, cropping system, and genetic background influence carrot performance including top height and flavor. Acta Horticulturacea. doi:https://doi.org/10.17660/ActaHortic.2017.1153.1

Hallett, S. G., Hoagland, L. A., & Toner, E. (2016). Urban agriculture: environmental, economic and social perspectives. Horticulture Reviews, 44, 65-109.

Reeve, J., Hoagland, L. A., Villalba, J., Carr, P., Attucha, A., Cambardella, C., . . . Davis (2016). Organic farming, soil health, and food quality: Considering possible linkages. Advances in Agronomy, 137, 1-49.

Shoaf, N., Egel, D. S., & Hoagland, L. A. (2016). Suppression of Phytophthora blight in sweet pepper depends on biochar amendment and soil type. Hortscience, 51(5), 518-524.

Rudisill, M., Turco, R. F., & Hoagland, L. A. (2016). Rhizosphere effects and fertility management influence nitrification and ammonia oxidizers in intensively managed vegetable production systems. Applied Soil Ecology, 99, 70-77.

Hoagland, L. A. (2015). Breeding for beneficial plant-microbial relationships: how do we get there? Eucarpia Workshop On Implementing Plant-Microbe interaction in Plant Breeding,, 23-24.

Rudisill, M., Turco, R. F., & Hoagland, L. A. (2015). Sustaining soil quality in intensively managed high tunnel vegetable production systems; a role for green manures and chicken litter. Hortscience, 50(3), 461-468.

Hoagland, L. A., Navazio, J., Zystro, F., Kaiser, J. L., Gomez-Vargas, J., & Gibson, K. D. (2015). Identification of key traits and adapted germplasm for an organic participatory tomato breeding program for the Midwest U.S. Hortscience, 50(9), 461-468.

DuToit, L., Derie, M., Christianson, C., Hoagland, L., & Simon, P. (2014). First Report of Bacterial Blight of Carrot in Indiana Caused by Xanthomonas hortorum pv. carotae. Plant Disease.

Horticulture & Landscape Architecture, 625 Agriculture Mall Drive, West Lafayette, IN 47907-2010 USA, (765) 494-1300

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