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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 Crop Systems


  • PhD, Soil Microbiology and Biochemistry, Washington State University
  • MS, Agroecology, University of Nebraska-Lincoln
  • BS, Environmental Science, University of Nebraska-Lincoln
Currently teaching:
  • Introduction to Urban Agriculture (SFS/HORT31200; taught every fall)
  • The Plant Microbiome (HORT52500; taught in spring, even years)
  • Agricultural, Environmental and Community Sustainability in Costa Rica (Spring Break 2019)
  • Agroecology Field Course in Colombia (new study abroad course coming summer 2020)

Research program: 

The long-term goal of our lab is to support the continued growth and sustainability of local specialty crop production (e.g. vegetables, herbs, fruit) in rural and urban areas by identifying practical approaches to increase the productivity, quality and safety of produce, while reducing negative impacts of crop production systems on the environment. Diversifying rural production systems with specialty crops and integrating specialty crop production into urban areas can provide new sources of income, improve human health and well-being, and bring broad environmental benefits. To effectively provide these services, specialty crop growers must be able to effectively manage nutrients, water and pests, while dealing with soil degradation, soil contaminants, food-borne pathogens and changing weather patterns. In addition, they need crop varieties that are adapted to local environmental and production constraints, and yield produce with end-use qualities that meet the demands of consumers.

In an effort to address these challenges, our lab studies soil microibal ecology and beneficial plant-microbial relationships. The soil microbial community regulates many key agroecosystem services including nutrient cycling, biological control of pathogens and pollutant detoxification. Moreover, some microbes can form intimate associations with plants, helping them acquire nutrients and water and withstand biotic and abiotic stress. New genomic tools have greatly expanded awareness of the abundance and diversity of soil and plant microbiomes, but understanding of how individual taxa evolve and proliferate in soil systems and mechanistically interact with plants to improve their health and performance is in its infancy. To overcome these knowledge gaps, we combine applied studies designed to address key production challenges with fundamental research that will elucidate mechanisms regulating beneficial plant-soil-microbial relationships. To ensure the relevance and potential application of our work, we emply a participatory research approach that engages growers in identification of the most pertinent production challenges, along with development and dissemintation of practical solutions using on-farm trials. 

Current projects are focused on:
  • Reducing heavy metal uptake in fruit and vegetable crops
  • Identifying biological approaches to reduce the severity of soil-borne and foliar pathogens in vegetables and mint crops
  • Improving nitrogen-use efficiency in vegetable crop production systems
  • Developing new, improved vegetable varieties that are best adapted to organic farming systems and produce fruit that is nutritious and has good flavor
Additional insights out our research program can be found on the Hoagland Lab Website: www.purdue.edu/hla/sites/hoaglandlab/

    Awards & Honors

    (2015) Millionaire's Club Award. Purdue University.

    (2011) Millionaires Club Award. Purdue University.

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

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

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

    Selected Publications

    Hoagland, L., Ximenses, E., Ku, S., & Ladisch, M. (2018). Foodborne pathogens in horticultural production systems: ecology and mitigation. Scientia Horticulturae, 236, 192-206.

    Colla, G., Hoagland, L., Ruzzi, M., Cardarelli, M., Bonini, P., Canaguier, R., & Rouphael, Y. (2017). Biostimulant Action of Protein Hydrolysates: Unraveling Their Effects on Plant Physiology and Microbiome. Frontiers in Plant Science, 22, 1-14. doi:doi.org/10.3389/fpls.2017.02202

    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

    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.

    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.

    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.

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

    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.

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

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