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首页> 外文期刊>Journal of Soil Science and Environmental Management >Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia
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Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia

机译：埃塞俄比亚南部西达玛地区的耕作系统下五种不同质地土壤对钾的吸附特性

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A laboratory study was conducted to determine the potassium (K) adsorption characteristics of five soils under enset (Ensete ventricosom cheesman) farming system in Sidama. Potassium adsorption isotherms were constructed by equilibrating 5 g soil samples with 5 levels of K (0 to 78mg/L) as KCl in 10 mmoles/L CaCl2 solutions. Suspensions were shaken for half an hour. Adsorption data were fitted to Freundlich, Langmuir and Temkin adsorption equations. On an average, amount of K adsorbed ranged from 29.2 to 67.82% of added K. Significant positive relationship existed among percent K adsorbed, CEC, percent clay and pH. Langmuir equation gave a better fit of equilibrium K adsorption data for sandy clay loam and silty clay loam soils, while Freundlich equation gave a better fit for clay and loam soils. Furthermore, Temkin isotherm gave a better fit of equilibrium K adsorption data for clay loam soil. Sandy clay loam and loam soils had low 1 values. The n values on the other hand indicated that the sorption is favorable only for these soils. The Freundlich adsorption capacity, kf were found low as compared to available soil potassium. The negative values of Langmuir isotherm maximum monolayer coverage capacity (a) for clay loam and clay soils agreed with the absence of best fit to the model. Sandy clay loam and silty clay loam which indicated best fit had high monolayer coverage. Value of Temkin isotherm equilibrium binding constant (AT) was high for clay loam soil and this was manifested by high coefficient of determination. Low values of constant related to heat of sorption (B) were determined for sandy clay loam and loam whilst clay loam, silty clay loam and clay soils indicated high binding energy (B).
机译：进行了一项实验室研究，以确定Sidama的Ensete ventricosom cheesman耕作系统下五种土壤的钾（K）吸附特性。钾吸附等温线是通过在5 mmol / L CaCl2溶液中平衡5 g土壤样品和5种K（0至78mg / L）的KCl含量而建立的。悬浮液摇动半小时。吸附数据符合Freundlich，Langmuir和Temkin吸附方程。平均而言，钾的吸附量为添加的钾的29.2％至67.82％。钾的吸附百分比，CEC，粘土百分比和pH之间存在显着的正相关关系。 Langmuir方程对沙质壤土和粉质粘土壤土的平衡K吸附数据拟合效果更好，而Freundlich方程对粘土壤土和壤土土壤的平衡钾吸附数据拟合效果更好。此外，Temkin等温线对粘土壤土的平衡K吸附数据拟合效果更好。沙质壤土壤土和壤土具有较低的1 / n值。另一方面，n值表明吸附仅对这些土壤有利。与可用的土壤钾相比，发现弗氏树脂的吸附能力kf低。 Langmuir等温线最大单层覆盖能力（a）对于粘土壤土和粘土的负值与模型的最佳拟合不符。砂土壤土和粉质土壤土表明最合适，单层覆盖率高。土壤土的Temkin等温线平衡结合常数（AT）值较高，这通过较高的测定系数得以体现。对于砂质壤土和壤土，测定了与吸附热相关的常数较低的值（B），而粘土壤土，粉质粘土壤土和粘土显示出较高的结合能（B）。

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