Haque, Md. Shahidul, et al. “EFFECTS OF APPLIED UREA IN THE SOIL ON DAILY CHANGES OF PH AND LENGTH OF PADDY (ORYZA SATIVA) GROWN IN THE SEEDLING”. Khulna University Studies, Nov. 2008, pp. 311-6, doi:10.53808/KUS.2008.9.2.0853-L.