The effect of Magnesium in the nature of the mineral Composition and its effect in the chemical Equilibrium forms of Potassium in the soil

Abstract

Studying the effect of adding magnesium in the dispersion of clay and its effect in the chemical equilibrium forms of potassium. A laboratory experiment was carried out on two types of soils, the first is clay S₁  and the second silt clay S₂. The soil was incubated with magnesium at two concentrations: 25 and 100 mmol Mg²⁺.L^-1. The results of the X-ray diffraction analysis showed that there was a change In the diffraction intensity of clay minerals and to the two concentrations, The X-ray diffraction analysis results also showed that the predominance of minerals in the two soils was  Smectite > Kao. = Mica > Chl. In the first, the second was  Smectite > Mica > Kao. > Chl. the results also showed that adding magnesium to the soil contributed to an increase in soluble and exchangeable potassium by 5.517, 28.276, 12.215, and 48.188% and a decrease in non-exchangeable potassium by 11.421 and 28.274% compared to the comparison treatment Mg₀ and for the two concentrations of 25 and 100 mmol Mg²⁺. L^-1, respectively, for clay soil, while in silt clay soil, the values of soluble and exchangeable increased by 15.789, 55.263, 20.800, and 37.200%, and non-exchangeable potassium decreased by 12.466 and 20.000% for the two concentrations of 25 and 100 mmol Mg²⁺.L^-1, respectively, compared to the comparison treatment Mg₀.