Anni Yuniarti, Benny Joy, Dirga Sapta Sara, Fazrin, and Intan, “The Effect of N, P, K and Si Fertilizers on Some Soil Chemical Properties, N, P uptake and Growth of Black Rice (Oryza sativa L. indica) in Ultisols”, ijlsar, vol. 3, no. 2, pp. 64–70, Feb. 2024.