“Ameliorate the effects of poultry manure and NPK fertilizer on the performance of pepper relay cropped with two cassava varieties”, GJSFR, vol. 11, no. 9, pp. 7–11, May 2011, Accessed: Feb. 06, 2026. [Online]. Available: https://www.journalofscience.org/index.php/GJSFR/article/view/299