Obi, Martin Eze, Department of Soil Science, Faculty of Agriculture, University of Nigeria, Nsukka (Nigeria)
Ogeh, Joseph Sunday, Department of Soil Science, Faculty of Agriculture, University of Benin (Nigeria)
Ogeh, Joseph Sunday, Department of Soil Science, Faculty of Agriculture, University of Benin, Benin City, Edo State 300001 (Nigeria)
Ogeh, Joseph Sunday, Department of Soil Science, Faculty of Agriculture, University of Benin, Benin City, Edo State, Nigeria (Nigeria)
Ogeh, Joseph Sunday, Department of Soil Science, University of Benin, Benin-City, Nigeria (Nigeria)
Ogunwole, Ogunlade Moses, Soil and Plant Nutrition Section, Cocoa Research Institute of Nigeria (Nigeria)
Oklima, Ade Mariyam, Department of Soil Science and Land Resources Faculty of Agriculture, Bogor Agricultural University, Bogor (Indonesia)
Oktafri, ., Agricultural Engineering Department, Lampung University, Jl Sumantri Brojonegoro No. 1 Bandarlampung 35145, INDONESIA. (Indonesia)
Oktaviyani, Trias, Jendral Soedirman University (Indonesia)
Osaki, Mitsuru, Laboratory of Rhizosphere Environment Technology, Division of Bio-systems Sustainability, Graduate School of Agriculture, Kita-9, Nishi-9, Kitaku, Sapporo 060-8589 (Japan)
Osaki, Mitsuru, National Institute for Agro-Environmental Science, Tsukuba, Ibaraki, Japan (Japan)
Osaki, Mitsuru, Graduate Study of Agriculture, Hokkaido University, Sapporo, Japan (Japan)
Osaki, Mitsuru, Laboratory of Rhizosphere Environment Technology, Division of Bio-systems Sustainability, Graduate School of Agriculture, Kita-9, Nishi-9, Kitaku, Sapporo 060-8589, JAPAN (Japan)
Ottow, Carl Gottlieb, Institute for Applied Microbiology, Justus Leibig University Heinrich-Buff-Ring 26-32, 35392 Gießen (Germany)
Owonubi, Ayodele, Forestry Research Institute of Nigeria, Federal College of Forestry, Jos (Nigeria)
Oyibo, Rukeme Orakpogbake, Department of Soil Science, Faculty of Agriculture, University of Benin, Benin City, Edo State, Nigeria (Nigeria)

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