Darmawan, ., Kyuma, K., Masunaga, T., Asmar, ., Darfis, I. and Wakatsuki, T. (2009) “The Long-Term Effect of Blanket Phosphorus Fertilizer Application on the Available P Content in Sawah Soils; Comparative Study in Java, Indonesia”, JOURNAL OF TROPICAL SOILS, 14(1), pp. 9–18. doi: 10.5400/jts.2009.v14i1.9-18.