Njuguna, M., P. Kamau, and R. Wanjogu. “) Varieties to Nitrogen Applied at Different Growth Stages”. International Journal of Professional Practice 6, no. 4 (October 11, 2018): pages 8–14. Accessed December 4, 2024. https://ijpp.kemu.ac.ke/index.php/ijpp/article/view/2.