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Differences in available phosphorus evaluated by soil tests in relation to detection by colorimetric and ICP-AES techniques

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  • J. Matula

    (Crop Research Institute, Prague, Czech Republic)

Abstract

Differences in the evaluation of soil phosphorus status by three soil tests (Mehlich 3, extraction with NH4-acetate and water extraction) were tested on 63 agricultural soils with different agrochemical characteristics from the territory of the Czech Republic. Differences between the colorimetric determination of phosphorus and ICP technique were studied. The median of the values of phosphorus supply in soils determined by soil tests was considerably different. Compared to the colorimetric detection of water extraction of soils the median of the NH4-acetate test showed 2.2 times higher values and in Mehlich 3 test the values were 34.8 times higher. The largest difference between the end-point analytical techniques of phosphorus determination, colorimetry and ICP-AES, was observed in the soil test of water extraction. The median of the values determined by ICP-AES was higher by 47%. In NH4-acetate extraction of soils the median of the measured values of phosphorus was higher by 12% and in Mehlich 3 extraction by 7%. Differences in phosphorus concentrations determined by colorimetry and by ICP-AES increased as the phosphorus supply in soils decreased. When the supply of 'available' phosphorus in soil is given, it is always necessary to specify the used soil test including the end-point analytical technique of phosphorus determination to avoid the misleading interpretation of results. The problem of phosphorus in agriculture and in the environment requires thorough revision and methodical standardization.

Suggested Citation

  • J. Matula, 2010. "Differences in available phosphorus evaluated by soil tests in relation to detection by colorimetric and ICP-AES techniques," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 56(6), pages 297-304.
    • Handle: RePEc:caa:jnlpse:v:56:y:2010:i:6:id:23-2010-pse
    DOI: 10.17221/23/2010-PSE
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    References listed on IDEAS

    as
    1. J. Matula, 2009. "A relationship between multi-nutrient soil tests (Mehlich 3, ammonium acetate, and water extraction) and bioavailability of nutrients from soils for barley," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 55(4), pages 173-180.
    2. J. Matula, 2009. "Possible phosphorus losses from the top layer of agricultural soils by rainfall simulations in relation to multi-nutrient soil tests," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 55(12), pages 511-518.
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    Citations

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    Cited by:

    1. J. Matula, 2011. "Relationship between phosphorus concentration in soil solution and phosphorus in shoots of barley," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(7), pages 307-314.
    2. G. Xu & J.N. Sun & R.F. Xu & Y.C. Lv & H.B. Shao & K. Yan & L.H. Zhang & M.S.A. Blackwell, 2011. "Effects of air-drying and freezing on phosphorus fractions in soils with different organic matter contents," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(5), pages 228-234.
    3. N.R. Amaizah & D. Cakmak & E. Saljnikov & G. Roglic & N. Kokovic & D. Manojlovic, 2013. "Effect of waste Al-phosphate on soil and plant," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(3), pages 130-135.
    4. J. Matula, 2011. "Determination of dissolved reactive and dissolved total phosphorus in water extract of soils," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(1), pages 1-6.
    5. G. Máthé-Gáspár & N. Fodor, 2012. "Modeling the phosphorus balance of different soilsusing the 4M crop model," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(9), pages 391-398.

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