FFA Floriculture Practice Test

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What can be added to soilless medium to provide magnesium prior to potting?

Epsom Salt
Calcium Carbonate
Perlite
Vermiculite

The correct answer is: Epsom Salt

The addition of Epsom Salt to a soilless medium effectively provides magnesium, which is essential for plant growth. Epsom Salt, chemically known as magnesium sulfate, contains both magnesium and sulfur. Magnesium is a critical macronutrient that plays a vital role in the process of photosynthesis, aiding in the formation of chlorophyll and contributing to the overall health of the plant. The presence of sulfur also supports various plant metabolic functions. Calcium Carbonate, while beneficial for providing calcium and raising soil pH, does not supply magnesium. Perlite mainly serves as a lightweight drainage component and does not contain magnesium or other nutrients. Similarly, vermiculite acts as a moisture-retentive medium but does not provide magnesium either. Thus, Epsom Salt is the most effective amendment when the goal is to ensure adequate magnesium levels in a soilless medium before potting.