What is the optimum range for magnesium (Mg) concentration in soil?

The optimum range for magnesium (Mg) concentration in soil is typically recognized to be between 60 and 120 parts per million (ppm). This range is considered ideal because it provides sufficient magnesium to support plant growth and development without risking toxicity or nutrient imbalance. Magnesium is an essential macronutrient that plays a crucial role in photosynthesis, enzyme function, and overall plant health.

When magnesium levels are within this optimal range, it promotes healthy root systems and effective nutrient uptake, enabling crops to thrive. Concentrations below this range can lead to magnesium deficiency, which often manifests in symptoms such as interveinal chlorosis in leaves. Conversely, excessive magnesium levels may disrupt the uptake of other essential nutrients like calcium and potassium, leading to nutrient imbalances and potential deficiencies.

Understanding nutrient concentrations in soil is vital for effective nutrient management and optimal crop production. This is core to the principles of sustainable agriculture and soil health promotion in Pennsylvania and beyond.