Tobias Ebong Oker

Tobias Ebong Oker

Farm Advisor

Ph.D. Biological and Agricultural Engineering, Kansas State University. 2018
M.S. Water Science and Engineering (Hydroinformatics), IHE Delft Institute for Water Education. 2010
B.S. Agricultural Engineering, Makerere University. 2006
Irrigation and Soils Management

Peer reviewed

  • Kikoyo, D.; Oker, T. E. (2023). Comparative Evaluation of the Performance of SWAT, SWAT+, and APEX Models in Simulating Edge of Field Hydrological Processes. Open Journal of Modelling and Simulation. Scientific Research Publishing. 11, 37-49. 04/06/23.
  • Lazarovitch, N.; Kisekka, I.; Oker, T. E.; Brunetti, G.; Wohling, T.; Xianyue, L.; Yong, L.; Skaggs, T. H.; Furman, A.; Sasidharan, S.; Raij-Hoffman, I.; Simunek, J. (2023). Modeling of Irrigation and Related Processes with HYDRUS. Advances in Agronomy. Sparks, Donald L. Academic Press. 181, 79-181.
  • Liakos, V.; Smith, E.; Andreis, J.; Vellidis, G.; Pavlou, D.; Orfanou, A.; Porter, W.; Oker, T.; Rabia, A. (2021). Blueberry app: a tool for irrigation scheduling on blueberries for the Southeastern. Precision agriculture ’21. Stafford, John V. Wageningen Academic Publishers. 871-876. 06/25/21.
  • Oker, T. E.; Kisekka, I.; Sheshukov, A.; Aguilar, J.; Rogers, D. H. (2021). Evaluating Soil Water Redistribution under Mobile Drip Irrigation, Low-Elevation Spray Application, and Low-Energy Precision Application Using HYDRUS. Journal of Irrigation and Drainage Engineering. American Society of Civil Engineers. 147:6. 06/01/21.
  • Oker, T. E.; Kisekka, I.; Sheshukov, A.; Aguilar, J.; Rogers, D. H. (2019). Evaluation of Dynamic Uniformity and Application Efficiency of Mobile Drip Irrigation. Irrigation Science. Springer. 38, 17-35. 09/06/19.
  • Aguilar, J.; Oker, T. E.; Kisekka, I. (2019). Mobile Drip Irrigation for Water Limited Crop Production: Initial Results. Kansas Agricultural Experiment Station Research Reports. K-State Research and Extension. 5:7. 08/13/19.
  • Oker, T. E.; Kisekka, I.; Sheshukov, A.; Aguilar, J.; Rogers, D. H. (2018). Evaluation of maize production under mobile drip irrigation. Agricultural Water Management. 210, 11-21. 11/30/18.
  • J., Wanyama; H., Ssegane; I., Kisekka; J., Komakech A.; N., Banadda; A., Zziwa; E., Oker T.; C., Mutumba; N., Kiggundu; K., Kayizi R.; B.., Mucunguzi D.; L., and Kiyimba F. (2017). Irrigation Development in Uganda: Constraints, Lessons Learned, and Future Perspectives. Journal of Irrigation and Drainage Engineering. 143:5. 01/24/17.
  • Kisekka, I.; Oker, T.; Nguyen, G.; Aguilar, J.; Rogers, D. (2017). Revisiting precision mobile drip irrigation under limited water. Irrigation Science. Springer. 35, 483-500. 09/04/17.
  • Candia, A.; Oker, T. E.; Lamo, J.; Obeti, G. L.; Yawe, J.; Adur, O. S. E.; R., Saasa A.; J., Muzei; J., Olupot; S., Epiku; W., Okiror; and Mutinda, I. (2015). Improved open-sun drying method for local swamp rice in Uganda. Uganda Journal of Agricultural Sciences. African Journals Online. 16:2.

Non-peer reviewed

  • Oker, Tobias (2025). Soil moisture sensing technologies and their applications for irrigation management in grape production. Consultant, Progress Crop. JCS Marketing/ Ag Marketing Solutions. 10:6. https://progressivecrop.com/2025/09/08/soil-moisture-sensing-technologies-and-their-applications-for-irrigation-management-in-grape-production/
  • Oker, Tobias (2024). General Irrigation Tips for Young Pistachios. San Joaquin Valley Trees and Vines blog. N, A. 05/29/24. https://www.sjvtandv.com/blog/general-irrigation-tips-for-young-pistachios
  • Oker, Tobias (2023). Pushing the Limits of Irrigation Efficiency: What is Possible? West Coast Nut Magazine. JCS Marketing Publication. 56-59. October 2023. https://issuu.com/myaglife/docs/wcn_october_2023_e?fr=xKAE9_zU1NQ