K. Kimani, S., J. M. Macharia, C. Gachengo, C. A. Palm, and R. J. Delve. “Maize Production in the Central Kenya Highlands Using Cattle Manures Combined With Modest Amounts of Mineral Fertilizer”. Uganda Journal of Agricultural Sciences 9, no. 1 (September 21, 2004): 480–490. Accessed November 21, 2024. http://journal.naro.go.ug/index.php/ujas/article/view/255.