Back 2 Basics

A Video Series from AgroLiquid

Calcium & Magnesium

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The Role of Calcium and Magnesium in Soil Health

Calcium and magnesium are essential for maintaining soil structure and nutrient mobility, directly influencing crop productivity. In a balanced soil, calcium should comprise 65–75% of base saturation, promoting better pore space, water infiltration, air movement, and root development. Magnesium should be maintained at 12–18%, too much can lead to compacted, poorly drained soils, while too little can affect photosynthesis and phosphorus movement within the plant.

Imbalances can also impact nitrogen efficiency. High magnesium soils reduce nitrogen utilization, forcing growers to apply more fertilizer to reach the same yield goals. Low calcium levels (often caused by overuse of anhydrous ammonia) can limit nitrogen fixation in legumes like soybeans and alfalfa.

Magnesium plays a dual role: it can hinder phosphorus availability in the soil while also being critical for moving phosphorus within the plant. This highlights the importance of evaluating base saturation and keeping cation levels in check for optimal nutrient availability, drainage, and soil performance.

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Continue Learning

Base Saturation

Calcium and Magnesium

Cation Exchange Capacity

Managing and Influencing Cations with Soil Amendments

Additional Downloadable Resources

The Natural Chem Lab pt 2

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The Natural Chem Lab pt 1

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Building a Crop Nutrition Program

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