C. K. , S., W. K. , N., & Kemei , M. K. (2015). Soil Fertility Improvement Using Crop Residues and Azolla for Sustainable Production of Rice and Fish in Irrigated Rice-Fish Farming System in the Lake Victoria Basin of Kenya . African Journal of Education,Science and Technology (AJEST), 2(3), Pg 76–83. Retrieved from http://ajest.org/index.php/ajest/article/view/237