Respuesta :
Magnesium ion increase the soil pH and neutralize the basic soil due to little rainfall. thus, option D is correct.
Who less rainfall affects the pH of soil?
In warm, humid environments, soil pH decreases over time in a process called soil acidification, due to leaching from high amounts of rainfall. In dry climates, however, soil weathering and leaching are less intense and pH can be neutral or alkaline.
Magnesium ion is vital to plant growth and health. It also increase the pH of the soil as it replace hydrogen ion which resulted in increase of acidity of soil.
Learn more about pH of soil here:
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