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203804

USE OF THERMODYNAMIC PARAMETERS OF Q−I ISOTHERMS TO EVALUATE OF K−AVAILABILITY IN SOME EGYPTIAN SOILS

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Last updated: 04 Jan 2025

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Abstract

    Quantity−intensity (Q/I) isotherms were applied to evaluate the availability of K+ in four different Egyptian soils. Wheat plant was used as an indicator to achieve this goal. After wheat sowing, soils were fertilized by K2SO4 at different rates of 0, 50, 100 and 150% of wheat's fertilizer recommendation. The obtained results showed that increasing added K+ concentrations led to increase the activity ratio of K+ (ARK0) and corresponding changes in labile K+ (K) at equilibrium. The equilibrium activity ratio of K+ (ARK0) varied between 2.88 − 15.01 × 10−3 (mol L−1)0.5 in initial stage and 1.39 − 17.31 × 10−3(mol L−1 )0.5 in the last stage. The labile K+ (KL) fraction ranged from 0.047 − 0.456 and 0.02 − 0.45 cmol kg−1 before sowing and at harvesting time of wheat plant, respectively. The potential buffering capacities of K+ (PBCK) fluctuated from 16.3 − 30.4 and 11.9 − 29.9 cmol kg−1 (mol L−1) −0.5 before sowing and at harvesting stage of wheat plant. The free energy of K+ exchange (−ΔG) ranged from −3.37 to −2.42 (kcal. mol−1) prior to cultivation to reach −3.79 to −2.34 (kcal. mol−1) at the end of cultivation period. In general, Silt, pH, EC, OM, Soluble K, NH4OAcK and HNO3K exhibited substantial correlations with KL, PBCK, ARK0, KG and ΔG, whereas pH had inverse correlation with mentioned parameters, except KG. Furthermore, a substantial correlation was observed between thermodynamic characteristics of K extracted by H2O, 1 M NH4OAc and 1M HNO3.  Conclusively: from these results it could be concluded that, significant correlation of the tested thermodynamic parameters with physicochemical soil characteristics. Thus, the study contributed significantly to practical K+ management by providing important information on K+ dynamics in typical Egyptian soils.  

DOI

10.21608/jpd.2021.203804

Keywords

Q/I relations, −Thermodynamic parameters of K, forms of K, Activity ratio of K, Gibb’s Free Energy

Authors

First Name

Haidy

Last Name

Emad El−Dean

MiddleName

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Affiliation

Department of Water And Soil Science, Faculty of Technology & Development Zagazig University, Egypt.

Email

ehaidy23@gmail.com

City

Faculty of Technology & Development Zagazig University, Egypt.

Orcid

-

First Name

Shawky

Last Name

Metwally

MiddleName

-

Affiliation

Department of Water And Soil Science, Faculty of Technology & Development Zagazig University, Egypt.

Email

shawkymetwally@zu.edu.eg

City

Faculty of Technology & Development Zagazig University, Egypt.

Orcid

-

First Name

Mohamed

Last Name

Ayman

MiddleName

-

Affiliation

Department of Water And Soil Science, Faculty of Technology & Development Zagazig University, Egypt.

Email

mayman@zu.edu.eg

City

Faculty of Technology & Development Zagazig University, Egypt.

Orcid

-

First Name

Magdy

Last Name

Mohamed

MiddleName

-

Affiliation

Ismailia Research Center, Ismailia, Egypt

Email

-

City

Ismailia Research Center, Ismailia, Egypt

Orcid

-

Volume

26

Article Issue

4

Related Issue

20763

Issue Date

2021-10-01

Receive Date

2021-07-27

Publish Date

2021-10-01

Page Start

825

Page End

841

Print ISSN

1110-2543

Online ISSN

2682-3322

Article File

JPD_Volume 26_Issue 4_Pages 825-841.pdf

PDF . 861.0kB

Link

https://jpd.journals.ekb.eg/article_203804.html

Detail API

https://jpd.journals.ekb.eg/service?article_code=203804

Order

16

Type

Original Article

Type Code

867

Publication Type

Journal

Publication Title

Journal of Productivity and Development

Publication Link

https://jpd.journals.ekb.eg/

MainTitle

USE OF THERMODYNAMIC PARAMETERS OF Q−I ISOTHERMS TO EVALUATE OF K−AVAILABILITY IN SOME EGYPTIAN SOILS

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Article

Created At

22 Jan 2023