Definition

Magnesium availability for crops depends on the balance between magnesium, potassium, and calcium. These elements compete for uptake by plant roots; for example, high potassium levels can reduce magnesium absorption. Additionally, low soil pH decreases magnesium availability.

Importance

Magnesium is essential for plant growth and development. Maintaining the right balance between potassium and magnesium is critical for optimal nutrient uptake. Eurofins Agro Testing’s Fertilisation Manager analysis provides tailored fertilisation advice and displays key ratios, such as potassium-to-magnesium, in its results.

Magnesium content in roughage

Roughage types with relatively high magnesium content include:

• Grass and grass silage
• Red clover
• Alfalfa and alfalfa silage

Conversely, cut corn, straw, and potato press fiber contain relatively low magnesium levels.

Table 1: Magnesium content (g/kg dm); Eurofins Agro Testing 2009-2013

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