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首页> 外文期刊>Agriculture, Forestry and Fisheries >Study of phosphorus adsorption and its relationship with soil properties, analyzed with Langmuir and Freundlich models
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Study of phosphorus adsorption and its relationship with soil properties, analyzed with Langmuir and Freundlich models

机译：用Langmuir和Freundlich模型分析磷的吸附及其与土壤性质的关系。

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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 CaCl_2, containing 0, 60, 120, 180, 240, 300, 360, 420, 480 and 540 mg kg~(-1) of applied external P as KH_2PO_4. 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 (K_f) and from 0.4874 to 1.012 for slope of the Freundlich isotherm (1). Among the soil properties (CaCO_3, 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 (K_f) 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.
机译：在2012年主季，研究了埃塞俄比亚北部提格里地区五种土壤类型的磷（P）吸附能力及其与某些性质的关系。研究了土壤中磷对Ca-P，Fe-P和Al-P的吸附作用，并研究了它们与土壤磷吸附特性的关系。通过在室温下用25 ml含0、60、120、180、180、240、300、360、420、480和540 mg的0.01 M CaCl_2平衡各个土壤样品24小时，可获得不同土壤类型的吸附数据。 kg〜（-1）施加的外部P为KH_2PO_4。这项研究的结果表明，除了槟榔之外，所有土壤中的Ca-P最高，然后是Fe-P。测试Langmuir和Freundlich吸附等温线均显示出在所有土壤中的相关系数（r）均介于0.951至0.999之间。比较这两种吸附模型，在Vertisols，Arenosols和Nitosols中，Freundlich模型在预测P吸附方面略好，而在Fluvisols和Cambisols中Langmuir模型则更好。从Langmuir等温线获得的最大吸附量（b）在Fluvisols中为296.6 mg P kg〜（-1）土壤到Vertisols中为820.4 mg P kg〜（-1）土壤。由朗缪尔吸附模型计算得到的与键能相关的常数在0.0151至0.0447 L mg〜（-1）之间变化。 Freundlich等温常数（K_f）的Freundlich吸附参数范围为7.28至30.15 mg kg〜（-1），Freundlich等温线的斜率（1 / n）的吸附参数范围为0.4874至1.012。在土壤性质（CaCO_3，CEC，有机物，EC，pH和沙，淤泥和粘土含量）中，粘土含量，CEC和CaCO3与Langmuir吸附最大值呈正相关。最大吸附量（P≤0.05）与土壤的EC显着相关（r = -0.902，但随含沙量的增加而降低。常数（K_f）与土壤EC呈正相关且显着（P≤0.05）（r = 0.953）。所研究的性质与吸附参数没有显着相关。

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