Abstract: The direct applications of PRs in three acid soils by Sorghum seeding and the incubation test mixed with PRs were investigated. It indicated Sorghum seeding severely appeared symptoms of P deficiency without application of P fertilizer. The fertilizer efficiency of PRs, except for JX-PR, was more efficient than that of SSP in comparison to application of 50 mg/kg SSP. The fertilizer efficiency of four PRs was NPR > MPR > HJP-PR > JX-PR, which was in according with 2% CA extractable P and with the increasing amount of soil effective P. Seeding dry matter was linear relationship with soil effective P. The amount of SiO2 and CaO in PRs had impact on its direct application.