1. The relationship between the yields of eight varieties of Nigerian maize and content of nitrogen, phosphorus and potassium in the leaf at flowering stage;Agboola;J. Agric. Sci.,1972
2. Influence of soil organic matter on cowpea's response to N fertilizer;Agboola;Agron. J.,1978
3. Fixation and excretion of nitrogen by tropical legumes;Agboola;Agron. J.,1972
4. Aktan, S. (1976). Nitrate nitrogen accumulation and distribution in the soil profile during a fallow grain rotation as influenced by different levels of soil profile moisture. M.S. Thesis, Oregon State University, Corvallis.
5. The effect of fertilizer applications on leaf and yield of sugar beets;Alexander;Proc. Am. Soc. Sugar Beet Technol.,1954