Summary
Phosphorus adsor tion isotherms were constructed for six Latosols and one calcareous soil from Hawaii which differed greatly in their phosphorus adsorption capacities. Equilibration was in 0.01M CaCl2 at 25°C for 6 or 8 days. P adsorption properties of the soils were characterised employing the linear form of Langmuir's equation and also by calculating the amount of P adsorbed between equilibrium concentrations of 0.25 to 0.35 ppm (estimates of P buffering capacities), following the procedure of Oaanne and Shaw13. The isotherms of all the soils were found to fit the Langmuir equation at low equilibrium concentrations (< 5 ppm) and the P adsorption maxima ranged from 520 to 10 500 ppm. The buffering capacity estimates correlated closely (r = 0.950) with the adsorption maxima of soils. However, in two soils, the estimates were much lower than expected from their adsorption maxima.
Millet (Pennisetum typhoides) was grown in these soils in pots, at 6 phosphorus levels corresponding to 6 equilibrium concentrations chosen from the phosphorus adsorption isotherms. Equilibrium concentrations at maximum growth of millet (Cmax) in Latosols varied inversely with the adsorption maxima of the soils. The relationship between these two parameters was expressed by the equation CmaX = a,b−k, where Cmax = equilibrium P concentration at maximum growth of millet, b = P adsorption maximum and a and k are constants. Quantitative expression of the constants are useful as they enable predictions of CmaX for a particular crop from the phosphorus adsorption maximum. This relation was found to hold also for the data on limed acid soils published by Woodruff and Kamprath20.
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References
Bache, B. W. and Williams, E. G., A phosphate sorption index for soils. J. Soil Sci. 22, 289–301 (1971).
Baker, D. E. and Woodruff, C. M., Influence of volume of soil per plant upon growth and uptake of phosphorus by corn from soils treated with different amounts of phosphorus. Soil Sci. 94, 409–412 (1962).
Beckwith, R. S., Sorbed phosphate at standard supernatant concentration as an estimate of the phosphate needs of soils. Australian J. Exptl. Agr. Anim. Husb. 5, 52–58 (1965).
Fox, R. L. and Kamprath, E. J., Phosphate sorption isotherms for evaluating the phosphate requirements of soils. Soil Sci. Soc. Am. Proc. 34, 902–907 (1970).
Fox, R. L., Plucknett, D. L., and Whitney, A. S., Phosphate requirements of Hawaiian Latosols and residual effects of fertilizer phosphorus. Intern. Congr. Soil Sci. Trans. 9th Congr. Australia 2, 301–310 (1968).
Lewis, D. G. and Quirk, J. P., Diffusion of phosphate in soil. Intern. Soc. Soil Sci. (New Zealand) Trans. Comm. IV and V, 132–138 (1962).
Mattingly, G. E. G., Rep. Rothamsted Expt. Sta., p. 59 (1957).
Mattingly, G. E. G., The influence of intensity and capacity factors on the availability of soil phosphate. Ministry of Agr., Fish and Food (London), Tech. Bull. No. 13, pp. 1–9 (1965).
McAuliffe, C. D., Hall, N. S., Dean, L. A., and Hendricks, S. B., Exchange reaction between phosphates and soils: Hydroxylic surfaces of soil minerals. Soil Sci. Soc. Am. Proc. 12, 119–123 (1947).
Olsen, S. R. and Watanabe, F. S., A method to determine a phosphorus adsorption maximum of soils as measured by the Langmuir isotherm. Soil Sci. Soc. Am. Proc. 21, 144–149 (1957).
Olsen, S. R. and Watanabe, F. S., Diffusion of phosphorus as related to soil texture and plant uptake. Soil Sci. Soc. Am. Proc. 27, 648–653 (1963).
Omanwar, P. K. and Robertson, J. A., Movement of phosphorus to barley roots growing in soil. Can. J. Soil Sci. 50, 57–64 (1970).
Ozanne, P. G. and Shaw, T. C., Phosphate sorption by soils as a measure of the phosphate requirement for pasture growth. Australian J. Agr. Research 18, 601–612 (1967).
Paauw, F. Van der, An effective water extraction method for the determination of plant-available phosphorus. Plant and Soil 34, 467–481 (1971).
Rajan, S. S. S. and Fox, R. L., Phosphate adsorption by soils. I. Influence of time and ionic environment on phosphate adsorption. Comm. in Soil Sci. and Plant Analysis 3, 493–504 (1972).
Rennie, D. A. and McKercher, R. B., Adsorption of phosphorus by four Saskatchewan Soils. Can. J. Soil Sci. 39, 64–75 (1959).
Sherman, G. D., Gibbsite-rich soils of the Hawaiian Islands. Hawaii Agr. Expt. Sta. Bull. No. 116 (1958).
Soundararajan, S. S., Sorbed and solution phosphorus and their relationships to crop response. Ph.D. dissertation University of Hawaii (1971).
Thompson, E. J., Olivera, A. L. F., Moser, U. S., and Black, C. A., Evaluation of laboratory indexes of absorption of soil phosphorus by plants. Plant and Soil 13, 28–38 (1960).
Woodruff, J. R. and Kamprath, E. J., Phosphorus adsorption maximum as measured by the Langmuir isotherm and its relationship to phosphorus availability. Soil Sci. Soc. Am. Proc. 29, 148–150 (1965).
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A part of the Ph.D. Thesis approved by the University of Hawaii, Honolulu, Hawaii, U.S.A. (1971).
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Rajan, S.S.S. Phosphorus adsorption characteristics of Hawaiian soils and their relationships to equilibrium phosphorus concentrations required for maximum growth of Millet. Plant Soil 39, 519–532 (1973). https://doi.org/10.1007/BF00264170
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DOI: https://doi.org/10.1007/BF00264170