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Sari, K., Supriadi, Siregar, A.Z. and Sibarani, M.J. 2020. Survey and Mapping of P Nutrient Status on Paddy Land in Aek Simare Irrigation Area, Laguboti District, Toba Samosir Regency, Northern of Sumatera, Indonesia. Jurnal Online Pertanian Tropik. 7, 1 (Apr. 2020), 25-31. DOI:https://doi.org/10.32734/jopt.v7i1.3821.