Biology and Fertility of Soils

, Volume 49, Issue 5, pp 587–596 | Cite as

Influence of phosphorus-solubilizing compounds on soil P and P uptake by perennial ryegrass

Original Paper


Found throughout the world, phosphorus (P)-fixing soils have long been studied for their effect on the availability of P fertilizers for crop production. It is known that organic acids in the rhizosphere affect P solubilization and uptake, although effectiveness has been shown to vary with acid, crop, and soil characteristics. Regardless, commercial products have been developed that include some formulation of organic acids intended to increase P solubility and uptake. Thus, the objective of this research was to evaluate the ability of the commercial P-solubilizing products Avail (maleic-itaconic copolymer) and P Miner (organic acid-based product) to maintain a greater pool of plant-available P for uptake by perennial ryegrass (Lolium perenne L.). Greenhouse experiments were conducted with P fertilization (0, 17, 34, and 50 kg P ha−1) and P solubilization materials in an incomplete 4 × 5 factorial design. Treatments were added to a soil with a high P-fixing capability and perennial ryegrass planted. Collected data included plant dry matter and P content, and acid (Mehlich-I) and labile (CaCl2) extractable soil P concentrations. Results are not definitive, but they indicate that both Avail and P Miner have the potential to improve available forms of P in the soil that are available to ryegrass. In these greenhouse trials, the application of P Miner at four times the recommended rate (480 kg ha−1) resulted in highest labile and acid-extractable P, while application of Avail and P Miner at the recommended rate (120 kg ha−1) resulted in the highest P uptake.


Phosphorus fixation Mehlich-I extractable phosphorus Soil phosphorus Phosphorus solubilization 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Agronomy and SoilsAuburn UniversityAuburnUSA

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