Dr. O. A. Orji has been involved in number of community services including some of the following:
- Resource person for Vegetable Cultivation Training; TAI Women Farmers Association, Rivers State. (17/3/2015).
- Resource person Vegetable Cultivation Training; Etche- Omuma Youth Farmers Association (20/3/2015).
- Hoop House Vegetable Production training for rural youth and women farmers at Directorate Leadership Institute, Port Harcourt; 11/1/16 to 15/1/2016.
- Resource Person on training on Homestead Vegetable Cultivation Enterprise for Kings Assembly Women Association. May 2016.
- Resource person for ‘Crop Cultivation for Money’ for Full Gospel Business Men’s Fellowship Capacity Development Workshop. (2017).
- Resource person for G20 Entrepreneurs Conference held at the Armphi Theatre, Rivers State University. 9/6/2017.
- Business Manager; Acta Agronomica Nigeriana Journal.
- Resource person for RSU Health Sensitization Week (18/2/19 to 22/2/19).
- Facilitator/ Resource Person for Training for The Sustainable Management of Soil Resources for Extension Officers and Farmers, Held 17th of November, 2021, by Nigerian institute of soil science, at Rivers State University, Port Harcourt, Nigeria.
- Facilitator/ Resource Person for Training on Enlightenment Programme on Climate-Smart Agricultural Practices for Farmers and Extension Agents in The Six Geopolitical Zones In Nigeria, Held 18th of February, 2022, by Nigerian institute of soil science, at Rivers State University, Port Harcourt, Nigeria.