Unacidulated and Partially acidulated phosphate rock: Agronomic effectiveness and the rates of dissolution of phosphate rock

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 01 Jan 1992 English Publisher:Springer Science and Business Media LLCJournal:Fertilizer Research, volume 33, pages 267-277 (issn: 0167-1731, eissn: 1573-0867,

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Authors: S. S. S. Rajan; J. H. Watkinson;

doi: 10.1007/bf01050882

Unacidulated and Partially acidulated phosphate rock: Agronomic effectiveness and the rates of dissolution of phosphate rock

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Abstract

The agronomic effectiveness of unground North Carolina phosphate rock (PR) and partially acidulated phosphate rocks (PAPR) prepared by acidulation of the PR with 30%, 40% and 50% of the phosphoric acid needed for complete acidulation, was determined in a 4 year field experiment on permanent pastures. The soil developed from volcanic ash, and was highly P retentive. The rate of dissolution in soil of the PR component in PAPR and of PR applied directly was measured, together with bicarbonate extractable P. The priming effect of the monocalcium phosphate (MCP) component of PAPR on root growth was also investigated.

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