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Potassium release kinetics and its correlation with pinto bean (Phaseolus vulgaris) plant indices

Author

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  • A.R. Hosseinpur

    (Department of Soil Science, College of Agriculture, Shahrekord University, Shahrekord, Iran)

  • H.R. Motaghian

    (Department of Soil Science, College of Agriculture, Shahrekord University, Shahrekord, Iran)

  • M.H. Salehi

    (Department of Soil Science, College of Agriculture, Shahrekord University, Shahrekord, Iran)

Abstract

The rate of potassium (K) release from soils is a dynamic process, and it is important to the evaluation of soil K availability to plant. The objectives of this study were to determine K release characteristics and the correlation of these parameters with bean plant indices in surface soils of 15 calcareous soils. The kinetics of K release was determined by successive extraction with 0.01 mol/L CaCl2 in a period of 2-2017 h at 25 ± 1°C. The results showed that the cumulative K‏ release ranged from 111 to 411 mg/kg. A plot of cumulative amount of K released showed a discontinuity in slope at 168 h. Thus, two equations were applied to segments of the total reaction time (2 to 168 and 168 to 2017 h). The amounts of K released during 2-168 and 168-2017 h ranged from 55 to 299 and 44 to 119 mg/kg, respectively. Release kinetics of K conformed fairly well to parabolic diffusion, simplified Elovich and power function models in two segments. Potassium released after 2-168 and 168-2017 h and K release rate constants were significantly correlated (P < 0.05) with bean plant indices, while correlation between K extracted by using 1 mol/L NH4OAc (ammonium acetate) and plant indices was not significant. The results of this research showed that information obtained from K release studies in laboratory and kinetics equation parameters can help to estimate the K supplying power of soils.

Suggested Citation

  • A.R. Hosseinpur & H.R. Motaghian & M.H. Salehi, 2012. "Potassium release kinetics and its correlation with pinto bean (Phaseolus vulgaris) plant indices," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(7), pages 328-333.
    • Handle: RePEc:caa:jnlpse:v:58:y:2012:i:7:id:70-2012-pse
    DOI: 10.17221/70/2012-PSE
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    References listed on IDEAS

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    1. A.R. Hosseinpur & M. Zarenia, 2012. "Evaluating chemical extractants to estimate available potassium for pinto beans (Phaseolus vulgaris) in some calcareous soils," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(1), pages 42-48.
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    Cited by:

    1. H.R. Motaghian & A.R. Hosseinpur, 2012. "Copper release kinetics: Effect of two extractants and wheat (Triticum aestivum L.) rhizosphere," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(10), pages 471-476.
    2. Gholamreza ZAREIAN & Mohammad Hady FARPOOR & Majid HEJAZI-MEHRIZI & Azam JAFARI, 2018. "Kinetics of non-exchangeable potassium release in selected soil orders of southern Iran," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 13(4), pages 200-207.

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