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Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models

Received: 6 January 2014     Published: 20 February 2014
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Abstract

Phosphorus (P) adsorption capacity and its relationship with some properties of five different soil types (Fluvisols, Cambisols, Vertisols, Arenosols and Nitosols) of Tigray Region, northern Ethiopia were studied during the main cropping season in 2012. Besides, fractionation of the total soil P in to Ca-P, Fe-P and Al-P was carried out and their relationships with P adsorption characteristics of the soil type under study were also studied. Adsorption data for the different soil types were obtained by equilibrating the respective soil samples for 24 hours at room temperature with 25 ml of 0.01 M CaCl2, containing 0, 60, 120, 180, 240, 300, 360, 420, 480 and 540 mg kg-1 of applied external P as KH2PO4. The results of this study showed that Ca-P was highest followed by Fe-P in all the soils except in the Arenosols. Testing the Langmuir and Freundlich adsorption isotherms both showed well fitted with the correlation coefficients (r) that ranged from 0.951 to 0.999 in all the soils. Comparing the two adsorption models, the Freundlich model was slightly better in Vertisols, Arenosols and Nitosols while the Langmuir model was better in the Fluvisols and Cambisols in predicting P adsorption. The adsorption maximum (b) obtained from the Langmuir isotherm ranged from 296.6 mg P kg-1 soil in Fluvisols to 820.4 mg P kg-1 soil in Vertisols. The constant related to bonding energy calculated from the Langmuir adsorption model varied from 0.0151 to 0.0447 L mg-1. The Freundlich adsorption parameters also ranged from 7.28 to 30.15 mg kg-1 for the Freundlich isotherm constant (Kf) and from 0.4874 to 1.012 for slope of the Freundlich isotherm (1/n). Among the soil properties (CaCO3, CEC, organic matter, EC, pH, and sand, silt, and clay contents), clay content, CEC and CaCO3 were positively correlated with the Langmuir adsorption maximum. The adsorption maximum significantly (P ≤ 0.05) correlated (r = -0.902 but decreased with increasing sand content. The constant (Kf) positively and significantly (P ≤ 0.05) correlated (r = 0.953) with EC of the soil. The remaining soil properties studied were not significantly correlated with the adsorption parameters.

Published in Agriculture, Forestry and Fisheries (Volume 3, Issue 1)
DOI 10.11648/j.aff.20140301.18
Page(s) 40-51
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Phosphorus Content, Isotherms, Freundlich Model, Langmuir Model, Soil Characterization, Ethiopian Soils

References
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    Fisseha Hadgu, Heluf Gebrekidan, Kibebew Kibret, Birru Yitaferu. (2014). Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models. Agriculture, Forestry and Fisheries, 3(1), 40-51. https://doi.org/10.11648/j.aff.20140301.18

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    Fisseha Hadgu; Heluf Gebrekidan; Kibebew Kibret; Birru Yitaferu. Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models. Agric. For. Fish. 2014, 3(1), 40-51. doi: 10.11648/j.aff.20140301.18

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    AMA Style

    Fisseha Hadgu, Heluf Gebrekidan, Kibebew Kibret, Birru Yitaferu. Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models. Agric For Fish. 2014;3(1):40-51. doi: 10.11648/j.aff.20140301.18

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  • @article{10.11648/j.aff.20140301.18,
      author = {Fisseha Hadgu and Heluf Gebrekidan and Kibebew Kibret and Birru Yitaferu},
      title = {Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models},
      journal = {Agriculture, Forestry and Fisheries},
      volume = {3},
      number = {1},
      pages = {40-51},
      doi = {10.11648/j.aff.20140301.18},
      url = {https://doi.org/10.11648/j.aff.20140301.18},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.aff.20140301.18},
      abstract = {Phosphorus (P) adsorption capacity and its relationship with some properties of five different soil types (Fluvisols, Cambisols, Vertisols, Arenosols and Nitosols) of Tigray Region, northern Ethiopia were studied during the main cropping season in 2012. Besides, fractionation of the total soil P in to Ca-P, Fe-P and Al-P was carried out and their relationships with P adsorption characteristics of the soil type under study were also studied. Adsorption data for the different soil types were obtained by equilibrating the respective soil samples for 24 hours at room temperature with 25 ml of 0.01 M CaCl2, containing 0, 60, 120, 180, 240, 300, 360, 420, 480 and 540 mg kg-1 of applied external P as KH2PO4. The results of this study showed that Ca-P was highest followed by Fe-P in all the soils except in the Arenosols. Testing the Langmuir and Freundlich adsorption isotherms both showed well fitted with the correlation coefficients (r) that ranged from 0.951 to 0.999 in all the soils. Comparing the two adsorption models, the Freundlich model was slightly better in Vertisols, Arenosols and Nitosols while the Langmuir model was better in the Fluvisols and Cambisols in predicting P adsorption. The adsorption maximum (b) obtained from the Langmuir isotherm ranged from 296.6 mg P kg-1 soil in Fluvisols to 820.4 mg P kg-1 soil in Vertisols. The constant related to bonding energy calculated from the Langmuir adsorption model varied from 0.0151 to 0.0447 L mg-1. The Freundlich adsorption parameters also ranged from 7.28 to 30.15 mg kg-1 for the Freundlich isotherm constant (Kf) and from 0.4874 to 1.012 for slope of the Freundlich isotherm (1/n). Among the soil properties (CaCO3, CEC, organic matter, EC, pH, and sand, silt, and clay contents), clay content, CEC and CaCO3 were positively correlated with the Langmuir adsorption maximum. The adsorption maximum significantly (P ≤ 0.05) correlated (r = -0.902 but decreased with increasing sand content. The constant (Kf) positively and significantly (P ≤ 0.05) correlated (r = 0.953) with EC of the soil. The remaining soil properties studied were not significantly correlated with the adsorption parameters.},
     year = {2014}
    }
    

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  • TY  - JOUR
    T1  - Study of Phosphorus Adsorption and Its Relationship with Soil Properties, Analyzed with Langmuir and Freundlich Models
    AU  - Fisseha Hadgu
    AU  - Heluf Gebrekidan
    AU  - Kibebew Kibret
    AU  - Birru Yitaferu
    Y1  - 2014/02/20
    PY  - 2014
    N1  - https://doi.org/10.11648/j.aff.20140301.18
    DO  - 10.11648/j.aff.20140301.18
    T2  - Agriculture, Forestry and Fisheries
    JF  - Agriculture, Forestry and Fisheries
    JO  - Agriculture, Forestry and Fisheries
    SP  - 40
    EP  - 51
    PB  - Science Publishing Group
    SN  - 2328-5648
    UR  - https://doi.org/10.11648/j.aff.20140301.18
    AB  - Phosphorus (P) adsorption capacity and its relationship with some properties of five different soil types (Fluvisols, Cambisols, Vertisols, Arenosols and Nitosols) of Tigray Region, northern Ethiopia were studied during the main cropping season in 2012. Besides, fractionation of the total soil P in to Ca-P, Fe-P and Al-P was carried out and their relationships with P adsorption characteristics of the soil type under study were also studied. Adsorption data for the different soil types were obtained by equilibrating the respective soil samples for 24 hours at room temperature with 25 ml of 0.01 M CaCl2, containing 0, 60, 120, 180, 240, 300, 360, 420, 480 and 540 mg kg-1 of applied external P as KH2PO4. The results of this study showed that Ca-P was highest followed by Fe-P in all the soils except in the Arenosols. Testing the Langmuir and Freundlich adsorption isotherms both showed well fitted with the correlation coefficients (r) that ranged from 0.951 to 0.999 in all the soils. Comparing the two adsorption models, the Freundlich model was slightly better in Vertisols, Arenosols and Nitosols while the Langmuir model was better in the Fluvisols and Cambisols in predicting P adsorption. The adsorption maximum (b) obtained from the Langmuir isotherm ranged from 296.6 mg P kg-1 soil in Fluvisols to 820.4 mg P kg-1 soil in Vertisols. The constant related to bonding energy calculated from the Langmuir adsorption model varied from 0.0151 to 0.0447 L mg-1. The Freundlich adsorption parameters also ranged from 7.28 to 30.15 mg kg-1 for the Freundlich isotherm constant (Kf) and from 0.4874 to 1.012 for slope of the Freundlich isotherm (1/n). Among the soil properties (CaCO3, CEC, organic matter, EC, pH, and sand, silt, and clay contents), clay content, CEC and CaCO3 were positively correlated with the Langmuir adsorption maximum. The adsorption maximum significantly (P ≤ 0.05) correlated (r = -0.902 but decreased with increasing sand content. The constant (Kf) positively and significantly (P ≤ 0.05) correlated (r = 0.953) with EC of the soil. The remaining soil properties studied were not significantly correlated with the adsorption parameters.
    VL  - 3
    IS  - 1
    ER  - 

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Author Information
  • School of Natural Resource Management and Environmental Science, Haramaya University, Haramaya, Ethiopia

  • School of Natural Resource Management and Environmental Science, Haramaya University, Haramaya, Ethiopia

  • School of Natural Resource Management and Environmental Science, Haramaya University, Haramaya, Ethiopia

  • Amhara Regional Agricultural Research Institute, Amhara National Regional State, Ethiopia

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