Research Publications

Recent publications (2010 - Present)

de Koff, J.P., and T. Broyles.  2019.  Extension agents' perceptions of climate change and training needs.  Natural Sciences Education 48:1-9.  doi:10.4195/nse2019.01.0001.

Tetteh, E., J.P. de Koff, B. Pokharel, R. Link, and C. Robbins.  2019.  Effect of winter canola cultivar on seed yield, oil, and protein content.  Agron. J. 111:1-10. doi:10.2134/agronj2018.08.0494

Illukpitiya, P., and J.P. de Koff.  2019.  An economic assessment of nutrient removal from switchgrass production.  Research in Applied Economics 11(2):26-38. doi: 10.5296/rae.v11i2.14998

Hui, D., C.-L. Yu, Q. Deng, P. Saini, K. Collins, and J. de Koff.  2018.  Weak effects of biochar and nitrogen fertilization on switchgrass photosynthesis, biomass, and soil respiration.  Agriculture 8:1-12.

Li, J.  S. Jian, J.P. de Koff, C.S. Lane, G. Wang, M.A. Mayes, and D. Hui.  2018. Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands.  GCB Bioenergy 1-12. doi: 10.1111/gcbb.12515

de Koff, J.P.  2017.  Drones in Extension programming: Implementation of adult and youth activities.  Journal of Extension 55(6):6FEA6.  Available at:

de Koff, J.P., J.C. Ricketts, C. Robbins, P. Illukpitiya, and A. Wade.  2017.  Meeting stakeholder energy technology education needs using a mobile demonstration.  Journal of Extension 55(6):6FEA8.  Available at:

Saini, P., J.P. de Koff, A. Allison, and C. Hamilton.  2017.  Changes in lignocellulosic polymers, carbon and energy in switchgrass for bioenergy production.  Agronomy Journal 109:1-9.  doi:10.2134/agronj2017.02.0063

Aziz, A., F. Tegegne, J.P. de Koff, and R. Wiemers.  2017.  Biofuel training workshops for diverse stakeholders ranging from pre-college students to educators.  Natural Sciences Education 46. doi:10.4195/nse2016.11.0033

Akinya, A., P. Illukpitiya, and J.P. de Koff.  2016.  Economic analysis of small scale on-farm production of biodiesel and vegetable oil for industrial use from winter oilseed crops.  Journal of Global Agriculture and Ecology 5(1):19-29.

de Koff, J.P., and A. Allison.  2015.  Changes in nutrient characteristics of switchgrass for bioenergy.  Agronomy Journal 107:2401-2409.

de Koff, J.P., P.A. Moore, Jr., R.D. Williams, R. Young, and P.J.A. Kleinman.  2013.  Utilizing water treatment residuals to reduce phosphorus runoff from biosolids.  J. Environ. Sci. and Eng. A 2:405-417.

de Koff, J.P., P.A. Moore, Jr., S.J. Formica, M. Van Eps, and P.B. DeLaune.  2011.  Effects of pasture renovation on hydrology, nutrient runoff, and forage yield.  J. Environ. Qual.  40:320-328.

de Koff, J.P., B.D. Lee, R.S. Dungan, and J.B. Santini.  2010.  Effect of compost-, sand-, or gypsum-amended waste foundry green sands on turfgrass yields and nutrient content.  J. Environ. Qual.  39:375-383.