Romadhon, Muhammad Rizal. “Soil Fertility Index on Rainfed and Irrigated Paddy Fields in Babat District, Lamongan”. Jurnal Keteknikan Pertanian, vol. 14, no. 3, Sept. 2026, pp. 335-63, https://doi.org/10.19028/jtep.014.3.335-363.