Effect of Different Magnesium Concentration inWater on Soil Characteristics and Determining the Critical Concentration

Document Type : Research Paper

Authors

Abstract

Usually, the impact of calcium and magnesium on improving and maintaining soil structure is
assumed to be similar. This study was conducted to investigate the effect of different concentrations
of magnesium on soil quality indicators. A clay loam soil was treated with four concentrations of
magnesium (0, 1, 2, 3, 4, and 5 mmol/L) during 4 months in a completely randomized design with
three replications. After this period, the mean weight diameter(MWD), wet aggregate
stability(WAS) , clay dispersion (DS) and soil saturated hydraulic conductivity(KS )were measured.
Analysis of variances showed that aggregate stability, hydraulic conductivity and clay dispersion
significantly (p<0.01) were affected by different magnesium concentrations. By 3 mmol/L of
magnesium wet aggregate stability and hydraulic conductivity increased due to substitution of the
sodium by magnesium which resulted in clay dispersion reduction. Substitution of the calcium by
magnesium in concentrations more than 3 mmol/L resulted in lower aggregate stabilities due to
special features of the magnesium such as higher hydrated radius and hydration energy compared to
the calcium.

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References

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Water and Soil Science
Volume 26, 2-2
September 2016
Pages 255-265

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