Evaluation of Adsorption Isotherm Models for Potassium Adsorption under Different Soil Types in Wolaita of Southern Ethiopia

Kassa, Mesfin; Haile, Wassie; Kebede, Fassil

doi:10.1080/00103624.2018.1563097

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…In comparison to the Langmuir and Temkin models, the Freundlich model exhibited an advanced match (Figure 4) of equilibrium K adsorption for the soil of silty loam type at Srwan site, as demonstrated by the (R 2 ) values coefficient (Table 2). These findings are consistent with Kassa et al [38], who indicated that the Freundlich model performed better than the other model in describing K adsorption. This was due to qualitative changes in the mineralogy and chemistry of the fractions that were separated [39].…”

Section: Comparison Of Different Adsorption Isothermssupporting

confidence: 92%

Potassium Adsorption Phenomenon in Calcareous Soils of Shahrazur Plain

Saeed¹

2021

KJAR

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A laboratory study for adsorption of potassium (K) determination was conducted on six soils located in Sharazur plain from the Kurdistan Region of Iraq in 2021 using the batch technique method. Potassium (K) adsorption isotherms were achieved by equilibrating 5.0 g of soil samples with eight grades of K (0 to 300 mg L-1) as KCl in 50 ml of 0.01M CaCl2 solution. To match the data of adsorption, Freundlich, Langmuir, and Temkin adsorption isotherms were used. The results show that the amount of adsorbed K ranged between (45.78 to 52.49) % added K. The Freundlich model fit the equilibrium K adsorption data better for the Serwan location of soil (silty loam), as demonstrated by a greater coefficient of determination (R2 =0.90). The value of heterogeneity factor 1/n for the Freundlich model ranged from (0.34 to 0.47) kg mg-1, which was less than one. The sorption processes for all of the studied soils were normal adsorption. The constant of the Langmuir isotherm (KL) aligned from (0.107 to o.425) L mg-1. Smaller KL values mean that more adsorbed K would be transformed to a non-exchangeable form, either through the creation of crystalline K or through ion occultation. The RL values indicate the type of isotherm, the values of RL> 1 that means the adsorption nature to be unfavorable. The Temkin equilibrium binding constant (AT) was high for all studied soils except the soils of Bestan Sur and Grdigo locations, the high value of AT indicates high binding energy. The Temkin constant (bT) ranged from (10.46 to 13.47) J mole-1 that was related to the nature of the adsorption energy, a positive value indicates that the adsorption process is exothermic.

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Section: Comparison Of Different Adsorption Isothermssupporting

confidence: 92%

Potassium Adsorption Phenomenon in Calcareous Soils of Shahrazur Plain

Saeed¹

2021

KJAR

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“…e low levels of exchangeable-K in many of the farming contradict with the generally held view that Ethiopia soils are rich in potassium. Several studies revealed that any activity associated with change in land use and agricultural management practices can affect soil properties and K dynamics [9][10][11][12], but the exchangeable and extractable K status of Wolaita soil K forms are unsatisfactory measures of nutrient availability since their concentration in the soil at any time is small in relation to long-term losses by crop removal and leaching and they give little indication of reserves of nonexchangeable but potentially available K. As limited research results are available on the balance of K for crop land systems in Kassa et al [13], the ability to predict yield responses to K fertilizers from K soil tests is limited and requires study; the objectives of this study were to (1) determine physical and chemical properties of the soils and (2) assess different types of K forms and dynamic in the different land uses. ([14], Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Forms and Dynamics of Soil Potassium in Acid Soil in the Wolaita Zone of Southern Ethiopia

Kassa

Kebede

Haile

2021

Applied and Environmental Soil Science

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Quantity-intensity (Q/I) characteristics are among conventional approaches for studying potassium dynamics and its availability. This was assessed to determine availability in four districts: namely, Sodo Zuria, Damot Gale, Damot Sore, and Boloso Sore, at three different land use systems (enset-coffee, crop land, and grazing land). Fractionation and dynamics of K sources were studied in soil samples, which were collected from 0–20 cm depth of each land system. The study revealed that water extractable K (H2O-K) concentrations ranged from 0.13 to 0.34 cmolc kg−1 soils at enset-coffee and grazing land use systems, respectively, and had a mean value of 0.28 cmolc kg−1 soils ammonium acetate extractable (NH4OAC-K) and nitric acid extract (HNO3-K) had a mean value of 0.25 cmolc kg−1 soils. In this study, the means of nonexchangeable- and exchangeable-K concentrations were of 0.11 and 0.14 cmolc kg−1 soils for land use types. Significant correlations were found between soil properties and Q/I parameters and among equilibrium solution parameters and Q/I parameters. There was no significant variation among the mean quantity values of the soils. The soils had higher change in exchangeable-K and potential buffering capacity than the enset-coffee land use soils, and the cop land had the highest values for these parameters. However, the enset-coffee land use soils had higher K-intensity. Therefore, application of site specific soil fertility management practices and research can improve soil K status and Q/I parameters to sustain productivity soils.

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“…As a result, equilibrium K appears to be a more accurate indicator of soil fertility (Bilias and Barbayiannis., 2019). To estimate the rate of additional K fertilizers in soils and create detailed K fertilizer recommendations, THERE IS a need for knowledge of the variance in K adsorption among soils and the equilibrium between the intensity and quantity phases of soil K (Kassa et al, 2019). As a result, K fertilization is crucial in meeting the K requirements of the plant cropping system.…”

Section: Introductionmentioning

confidence: 99%

Potassium release as affected by soil indigenous properties in some soils of Upper Egypt. تأثير بعض خواص التربة علي انطلاق عنصر البوتاسيوم في بعض أراضي مصر العليا

حسين¹

2023

مجلة المعهد العالي للدراسات النوعية

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Recently, K has become a critical nutrient for plant growth, especially in soils of coarse textures. Moreover, K is readily leached out from soils when irrigation waters or soil solutions contain high concentrations of calcium and other cations and affected by soil clay type. Thus, a multicorrelation study was conducted to find the relations between clay contents in the investigated soils and the available forms of K in soil and investigating the reaction pathways of Kfertilizer applied at different rates to soils with different textures. Soil samples collected from 4 different sites i.e., Wadi El-Nokra, Garf Hussein, El-Gaafrah, and Adndan. A sorption experiment was conducted using a series of K concentrations (20-180 mg L -1 ) on the investigated soils. The obtained relations were fitted to three adsorption isotherms, i.e., Langmuir, Bemmelen-Freundlich, and Temkin. Results show that both water soluble-K and the NH 4 OAC-K significantly correlated with the clay contents in the study soils (P=0.020 and 0.034, respectively). Results revealed that Van Bemmelen-Freundlich isotherm model seemed to be the best model fitting K sorption data in all the investigated soils. concentrations of water-soluble K increased significantly, with increasing the rate of applied K (mg kg 1 ). It seems that soil type played an essential role in increasing the retention of K in soil, i.e., the lowest increases in the water-soluble K occurred in soils with the highest clay contents in El-Gaafrah soil (Clay, 77.45% clay), whereas the highest increases occurred in Garf Hussein (Sandy Loam, 17.91% clay) and Wadi El-Nokra (Sandy Clay Loam, 35.69% clay). water-‫مجلة‬ ‫النوعية‬ ‫للدراسات‬ ‫العالي‬ ‫المعهد‬ ‫مجلد‬ 3 ‫ع‬ ‫دد‬ 1 ‫يناير‬ ( 2023 ) ( ‫ت‬ ‫أ‬ ‫ثير‬ ‫بعض‬ ‫خواص‬ ‫التربه‬ ‫علي‬ ‫انطالق‬ ‫عنصر‬ ‫البوتاسيوم‬ …….. ) ‫ربيع‬ ‫الرحمن‬ ‫عبد‬ 918soluble K decreased significantly with increasing contact time. NH 4 OAc-K increased in soil with increasing the rate of applied K. On contrary, these concentrations increased with increasing the contact time with soil.

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Evaluation of Adsorption Isotherm Models for Potassium Adsorption under Different Soil Types in Wolaita of Southern Ethiopia

Cited by 12 publications

References 15 publications

Potassium Adsorption Phenomenon in Calcareous Soils of Shahrazur Plain

Potassium Adsorption Phenomenon in Calcareous Soils of Shahrazur Plain

Forms and Dynamics of Soil Potassium in Acid Soil in the Wolaita Zone of Southern Ethiopia

Potassium release as affected by soil indigenous properties in some soils of Upper Egypt. تأثير بعض خواص التربة علي انطلاق عنصر البوتاسيوم في بعض أراضي مصر العليا

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