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Secondary Macronutrients

Last updated: February 26, 2019

What Does Secondary Macronutrients Mean?

Secondary macronutrients are often used in gardening to help plants that are in distress while boosting their overall health and growth. The main secondary macronutrients include magnesium, sulfur, and calcium.

Contrary to popular belief, secondary macronutrients are just as important as primary macronutrients for the plant’s well-being. However, plants require minimal amounts of secondary macronutrients. Any excess might kill the plants or budding roots.

Secondary macronutrients may also be known as secondary nutrients.

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Maximum Yield Explains Secondary Macronutrients

An extremely important secondary macronutrient is calcium. This particular element is ideal for the soil’s pH, which enables the plants to absorb all the nutrients in the soil. It also allows the soil to become more alkaline. Similarly, magnesium is an excellent enzyme activator, which promotes botanical growth and flowering. Sulfur protects the leaves and prevents yellowing or premature aging.


Most gardeners find it difficult to calculate the exact amount of secondary macronutrients their plants require. In some cases it is necessary to analyze the soil and find out exactly what elements are lacking. Consequently, gardeners will determine the grade of fertilizer that is best suited for their plants.

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SoilPlant NutritionPlant Growth

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