USC 4th floor
As department head, I am responsible for all strategic, operational, financial and human resource activities of the Department of Horticulture and Landscape Architecture (HLA), as well as serving as a contributing member of the leadership team for the College of Agricultural Sciences.
My research focuses on development of fertilizers and soil fertility management approaches that optimize plant and human nutrition while protecting environmental quality. Nitrogen fertilizer is estimated to contribute about two-thirds of greenhouse gas emissions attributed to crop production. But without fertilizers, crop yields would be halved, a loss that humanity cannot afford. Therefore, we have been working towards development of fertilizers that can be produced locally, moving towards a truly local agriculture and avoidance of fossil fuel usage during shipping. Current research is focused on tree fruit and vegetable production systems.
Courses I Teach:
I am currently revising AGRI 192/292 and conducting a series of tours for our new undergraduate students to get to know the People and Places of HLA.
I coordinate HORT 792 Graduate Seminar.
In addition, I am the Coordinator of the Peace Corps Masters International Program for the College of Agricultural Sciences. This Master of Agriculture degree program combines coursework with 2 years in the Peace Corps to provide students with applied international experience while pursuing a graduate degree.
Extension and Outreach:
The HLA department has a diverse group of stakeholders. I am developing a Stakeholder Advisory Team with whom I will meet regularly in order to guide our teaching, research, and outreach activities.
Gray, J.L., T. Borch, E.T. Furlong, J.G. Davis, T.J. Yager, Y. Yang, and D.W. Kolpin. 2017. Rainfall runoff of anthropogenic waste indicators from agricultural fields applied with municipal biosolids. Science of the Total Environment 580: 83-89. http://dx.doi.org/10.2016/j.scitotenv.2016.03.033.
Mikha, M.M., D.P. Widiastuti, T.T. Hurisso, J.E. Brummer, and J.G. Davis. 2017. Influence of composted dairy manure and perennial forage on soil carbon and nitrogen fractions during transition into organic management. Agriculture 7: 37. doi:10.3390/agriculture7050037.
Barminski, R., H. Storteboom, and J.G. Davis. 2016. Development and evaluation of an organically-certifiable growth medium for cyanobacteria. Journal of Applied Phycology. DOI 10.1007/s10811-016-0819-2.
Toonsiri, P., S.J. Del Grosso, A. Sukor, and J.G. Davis. 2016. Greenhouse gas emissions from solid and liquid organic fertilizers applied to lettuce. Journal of Environmental Quality. 45:1812. Doi:10.2134/jeq2015.12.0623.
Tsekeke, A., T. Degefu, E. Wolde-Meskel, and J. Davis. 2016. The effect of pond depth and lining plastic color on nitrogen fixing capacity of cyanobacteria, Anabaena strain E3. African Journal of Biotechnology 15: 1442-1451. DOI: 10.5897/AJB2015.15173.