Use of thermodynamic parameters of q−i isotherms to evaluate of k−availability in some Egyptian soils
Joint Authors
Mutawalli, Shawqi Muhammad
al-Mansi, Muhammad
Muhammad, Ayman
Imad al-Din, Haidy
Majdi, Muhammad
Source
Journal of Productivity and Development
Issue
Vol. 26, Issue 4 (31 Oct. 2021), pp.825-841, 17 p.
Publisher
Zagazig University Faculty of Technology and Development
Publication Date
2021-10-31
Country of Publication
Egypt
No. of Pages
17
Main Subjects
Topics
Abstract EN
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.
American Psychological Association (APA)
Imad al-Din, Haidy& Mutawalli, Shawqi Muhammad& al-Mansi, Muhammad& Majdi, Muhammad& Muhammad, Ayman. 2021. Use of thermodynamic parameters of q−i isotherms to evaluate of k−availability in some Egyptian soils. Journal of Productivity and Development،Vol. 26, no. 4, pp.825-841.
https://search.emarefa.net/detail/BIM-1294931
Modern Language Association (MLA)
Imad al-Din, Haidy…[et al.]. Use of thermodynamic parameters of q−i isotherms to evaluate of k−availability in some Egyptian soils. Journal of Productivity and Development Vol. 26, no. 4 (2021), pp.825-841.
https://search.emarefa.net/detail/BIM-1294931
American Medical Association (AMA)
Imad al-Din, Haidy& Mutawalli, Shawqi Muhammad& al-Mansi, Muhammad& Majdi, Muhammad& Muhammad, Ayman. Use of thermodynamic parameters of q−i isotherms to evaluate of k−availability in some Egyptian soils. Journal of Productivity and Development. 2021. Vol. 26, no. 4, pp.825-841.
https://search.emarefa.net/detail/BIM-1294931
Data Type
Journal Articles
Language
English
Notes
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Record ID
BIM-1294931