Devaras, L. A., Escalada, R. G. and Quirol, B. F. (1982) “EFFECT OF FLY ASH ON THE GROWTH AND YIELD OF SWEET POTATO”, Annals of Tropical Research, 4(2), pp. 85–91. Available at: https://atr.vsu.edu.ph/article/view/762 (Accessed: 5 December 2025).