Volume 17, Issue 64 (summer 2013)                   jwss 2013, 17(64): 221-235 | Back to browse issues page

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Hosseinpur A, Motaghian H, Raeisi Gahrooee1 T. Evaluation of Potassium Release Characteristics Using Dilute Calcium Chloride and Citric Acid Solutions in Some Calcareous Soils. jwss 2013; 17 (64) :221-235
URL: http://jstnar.iut.ac.ir/article-1-1614-en.html
, hosseinpur-a@agr.sku.ac.ir
Abstract:   (17987 Views)
Information about potassium (K) release characteristics in the Chaharmahal-va-bakhtiari soils is limited. In this study, K release kinetics of fifteen calcareous soils was investigated. Soil samples were extracted using successive extractions with 0.01 M CaCl2 and citric acid solutions for 2-2017 h at 25±1 0C. Moreover, soil K was determined using 6 chemical extraction methods. The results showed that released K ranged from 111 to 411 mg kg-1in calcium chloride solution and from 177 to 1199 mg kg-1 in citric acid solution for 2017 h. Amounts of extracted K using any extraction methods were different. Result of kinetics study and chemical methods indicates that K supplying power of the soils is different. A plot of cumulative amounts of released K shows a discontinuity in slope at 168 h. Thus, two equations were applied to the total reaction time (2 to 168 and 168 to 2017 h). Moreover, results showed that release kinetics of K conformed fairly well to parabolic diffusion, simplified Elovich and power function models in two segments in 0.01 M CaCl2 and citric acid. In addition, results showed that correlation between released K by using 0.01 M calcium chloride and citric acid and extracted K using chemical methods was significant. The results of this research showed that kinetic studies and soil testing could be used for evaluating K fertility status of studied soils.
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Type of Study: Research | Subject: Ggeneral
Received: 2011/08/23 | Accepted: 2012/10/20 | Published: 2013/09/16

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