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Jordan University of Science and Technology (JUST) 2004

Boron Soption in Selected Soils of Varying CaC03 Content in Jordan

Amer "Mohammed Rateb" Ahmed Tubeishat

Titre : Boron Soption in Selected Soils of Varying CaC03 Content in Jordan

Auteur : Amer "Mohammed Rateb" Ahmed Tubeishat

Université de soutenance : Jordan University of Science and Technology (JUST)

Grade : Master of Science (MS) 2004

Résumé
Boron is an essential micronutient element in plant nutrition. The range in its concentration between sufficiency and toxicity levels is narrow. Plants generally respond to the boron activity in soil solution. Boron is retained by soils via adsorption. Determining its activity in soil solution is important to the understanding of the mechanisms and reactions affecting its adsorption on soil materials. Boron adsorption is affected by a wide range of environmental factors and soil physico-chemical properties, among them is CaCO3 content of soil. Calcium carbonate (CaCO3) is a common mineral in Jordanian soils. This study investigated the effect of CaCO3 content on boron adsorption in Jordanian soils. The results shown that most of the studied soils conformed to the Freundlich adsorption isotherm at the entire adsorption range (0-200 μg B/ml), with less degree of conformity to the Langmuir adsorption isotherm. But the conformity to the Langmuir was improved after omitting high points form the curve, and it showed better conformity at the range (0-15 μg B/ml). We also found that the adsorption maxima measured by the Langmuir adsorption isotherm (b) ranged between 24.6 μg B/ml (soil 4) and 557 μg B/ml (soil 7). The effect was of CaCO3 or any of the soil properties studied was not evident to affect the process of boron adsorption to Jordanian soils due to many reasons like : small number of soils investigated, complexity of the adsorption process at the soils and soil materials, lack of testing to other soils properties like clay minerals and Fe and Al oxides, which might play an important role in the adsorption process.

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Page publiée le 6 novembre 2016, mise à jour le 22 mars 2019