Sooksavat, A. and Suwannathada, P. 1999. Infulence of Phosphorus, Nitrogen and Organic Fertilizers on Rice Yield and Available Soil Phosphorus. Thai Agricultural Research Journal. 17, 2 (Oct. 1999), 191–204. DOI:https://doi.org/10.14456/thaidoa-agres.1999.20.