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Obalum, Sunday E., Department of Soil Science, Faculty of Agriculture, University of Nigeria, Nsukka, 410001, Enugu State Prince Abubakar Audu University, Anyigba, PMB 1008 Anyigba, Kogi State
Obi, Justina O., Department of Crop Science, Faculty of Agriculture, University of Nigeria, Nsukka, 410001, Enugu State
Obi, Martin E., Department of Soil Science, Faculty of Agriculture, University of Nigeria, Nsukka, 410001, Enugu State
Ogunwole, Joshua, Bowen University, Iwo, P.M.B. 284, Osun State
Okorie, Benedict Odinaka, Department of Plant Physiology, Biochemistry, and Genetics. Agricultural University – Plovdiv
Olivares Campos, Barlin Orlando, Universidad de Córdoba
Onah, Chinaza J., Department of Soil Science, Faculty of Agriculture, University of Nigeria, Nsukka, 410001, Enugu State
Ozongwu, Ogorchukwu V., Department of Soil Science, Faculty of Agriculture, University of Nigeria
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