1 23 Nutrient Cycling in Agroecosystems (formerly Fertilizer Research) ISSN 1385-1314 Nutr Cycl Agroecosyst DOI 10.1007/s10705-012-9539-4 Simulating impact of seasonal climatic variation on the response of maize (Zea mays L.) to inorganic fertilizer in sub- humid Ghana B. Y. Fosu-Mensah, D. S. MacCarthy, P. L. G. Vlek & E. Y. Safo