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Akande, M. O., Oluwatoyinbo, F. I., Kayode, C. O., & Olowokere, F. A. (2006). Response of maize (Zea mays) and okra (Abelmoschus esculentus) intercrop relayed with cowpea (Vigna unguiculata) to different levels of cow dung amended phosphate rock. World Journal of Agricultural Sciences, 2(1), 119-122. Retrieved from https://pdfs.semanticscholar.org/734e/ecab6e2e1425f136f9967fc42838f0bbd3e0.pdf