Syarif, Abdul Syukur, et al. “Role of Rice Straw Compost and Potassium in Controlling Blast Disease of Paddy Rice in South Sulawesi, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 36, no. 4, Oct. 2017, pp. 244-5, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/8263.