Okalia, Deno, Fakultas Pertanian Universitas Islam Kuantan Singingi Teluk Kuantan
Oktafian, Akhmad Rizal, Study Program of Plant Pathology, Faculty of Agricultural Bioindustry and Forestry, Brawijaya University, Malang, Indonesia
Oktafiyanto, Muhammad Firdaus, Fakultas Pertanian, Universitas Jenderal Soedirman
Oktarina, Oktarina, Universitas Muhammadiyah Jember
Oktarina, Yetty, Universitas Baturaja
Oktavia, Masrinda, Department of Agronomy, Faculty of Agriculture, Universitas Hasanuddin, Makassar, Indonesia
Oktaviani, Indah, Institut Teknologi Sumatera
Oktoyoki, Hefri, Universitas Pat Petulai
Olosunde, Olatunde Musibau, Federal University of Agriculture, Abeokuta.
Opung, Melvin Kala, Dry Land Agriculture Masters Study Program, Faculty of Agriculture, Universitas Udayana, Denpasar, Indonesia
Osunde, Michael Omofowa, Department of Soil Science and Land Resources Management, Faculty of Agriculture, Obafemi Awolowo University, Nigeria
Owbel, Owbel, Fakultas Pertanian Universitas Andalas