Most of trials in new Zealand radiate pine (P. radiate) plantations were conducted on podzol soils and Mapua sandy loam soils. Few trials were conducted on Allophanic soils in the country. A better understanding on change in P chemistry and tree growth due the application of P fertilizer on an Allophanic soils is important to determine appropriate management practice for the P fertilizer. A glasshouse trial was carried out to investigate changes in the soil available P, the P nutrion, growth of P. radiate seedlings, and to determine relationhips of soil plant-available P with plant P on an allophanicsoil, following the application of three rates of triple superphosphate (TSP) in a glasshouse.  The results showed that the application of P fertilizer enhanced the P availability in the soils  of radiata seedlings as measured by the Bray-2 concentrations.  The dry matter yield and the P concentrations in needles, stem, and roots of radiata pine increased also with increased rates of triple superphosphate application to a P-deficient allophonic soil. Futhermore, P concentration in the new shoot needles had significant logarithmic relationship with bray-2P concentration in the soil under the radiata seedling. This curvilinear relationship suggests that the P concentration of new shoot needles diminishes with an increase in the plant-available P concentration (Bray-2 P) in this high-P fixing allophonic soil.  Oleh: Rivaie Arivin A (Balai Pengkajian Teknologi Pertanian Maluku (Indonesia). International Research Journal of Agricultural Science and Soil Science. Year 2013, vol. 3(1) p.5-10