Delineation of Soil Fertility Management Zones for Site-specific Nutrient Management in the Maize Belt Region of Nigeria von Aliyu, Kamaluddin T., Y. Kamara, Alpha, M. Jibrin, Jibrin, E. Huising, Jeroen, M. Shehu, Bello, Adewopo, Julius B., B. Mohammed, Ibrahim, Solomon, Reuben, M. Adam, Adam, M. Samndi, Ayuba

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