The availability of P from phosphate-goethite bridging complexes. Desorption and uptake by ryegrass Authors
Received: 04 October 1978 Revised: 20 March 1979 DOI:
Cite this article as: Parfitt, R.L. Plant Soil (1979) 53: 55. doi:10.1007/BF02181879
Pot trials using phosphated-goethite (bridging complex) as the source of P for ryegrass were established. No P was readily available to ryegrass until the surface was >40% covered with phosphate ions. Availability increased as the P level in solution increased up to 2 μ
M. Maximum availability was attained when the initial concentration of P in solution was 2 μ M which occurred at about 75% coverage on geothite. Mycorrhiza increased the availability of phosphate at a level of about 0.5–2 μ M P (60–70% coverage of the goethite surface).
Laboratory experiments showed that citrate ions were particularly effective in displacing P from goethite and the Olsen reagent was a good predictor of P availability to ryegrass.
Aluminium hydrous oxides
Iron hydrous oxides
Atkinson, R. J., Posner, A. M. and Quirk, J. P. 1972 Crystal nucleation in Fe(III) solutions and hydroxide gels. J. Inorg. Nucl. Chem.
Barrow, N. J. and Shaw, T. C. 1975 The slow reactions between soil and anions. Soil Sci.
Bhat, K. K. S., Nye, P. H. and Baldwin, J. P. 1976 Diffusion of phosphate to plant roots in soil IV. The concentration distance profile in the rhizosphere of roots with root hairs in a low-P soil. Plant and Soil
Bitter, T. and Muir, H. M. 1962 A modified uronic acid carbazole reaction. Anal. Biochem.
Foster, R. C. and Rovira, A. D. 1976 Ultrastructure of wheat rhizosphere. New Phytol.
Hingston, F. J., Posner, A. M. and Quirk, J. P. 1974 Anion adsorption by goethite and gibbsite. II. Desorption of anions from hydrous oxide surfaces. J. Soil Sci.
Martin, J. K. 1977 Factors influencing the loss of organic carbon from wheat roots. Soil Biol. Biochem.
Marschner, H., Römheld, V. and Azarabadi, S. 1978 Iron stress responses of efficient and inefficient plant species. 8th International Colloquium on Plant Analysis and Fertilizer Problems,
2, 319–327, Auckland.
Moghimi, A. 1977 Significance of 2-ketogluconic acid in dissolution of phosphate minerals by rhizosphere products. Ph.D. Thesis. University of Adelaide.
Nye, P. H. 1977 The rate-limiting step in plant nutrient absorption from soil. Soil Sci.
Parfitt, R. L. 1978 Anion adsorption by soils and soil materials. Adv. Agron.
Parfitt, R. L. 1979 The nature of the phosphate-goethite (α-FeOOH) complex formed with Ca(H
2PO 4) 2 at different surface coverage. Soil Sci. Soc. Am. J. 43, ( in press).
Parfitt, R. L. and Smart, R. St. C. 1978 The mechanisms of sulfate adsorption by iron oxides. Soil Sci. Soc. Am. J.
Parfitt, R. L., Russell, J. D. and Farmer, V. C. 1976 Confirmation of the surface structures of goethite (α-FeOOH) and phosphated goethite by infrared spectroscopy. J. Chem. Soc. Faraday Trans. 1,
Rosen, H. 1957 A modified ninydrin colorimetric analysis for amino acids. Arch. Biochem. Biophys.
CrossRef PubMed Copyright information
© Martinus Nijhoff Publishers 1979