1. Beck MA, Sanchez PA (1994) Soil phosphorus fraction dynamics during 18 years of cultivation on a typic paleudult. Soil Sci Soc Am J 58(5):1424–1431
2. Cardoso I, Janssen B, Oenema O, Kuyper T (2003) Phosphorus pools in oxisols under shaded and unshaded coffee systems on farmers’ fields in Brazil. Agrofor Syst 58(1):55–64
3. Chepote RE, Santana SO, Araujo QR, Sodré GA, Reis EL, Pacheco RG, Marrocos PC, Serôdio MH, Valle RR (2012) Land evaluation and soil fertility in cacao plantations. In: Valle RR (ed) Science, technology andmanagement of cacao tree. CEPLAC/CEPEC, Ilhéus, pp 67–113
4. Chessel D, Dufour AB, Thioulouse J (2004) The ade4 package I: one-table methods. R News 4:5–10
5. Comerford NB, de Barros NF (2005) Phosphorus nutrition of forest trees. In: Sims TJ, Sharpley AN (eds) Phosphorus: agriculture and the environment. Agronomy monograph 46. American Society of Agronomy, Madison, WI, pp 541–558