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The Secondary Nutrients (pdf)
Soil Fertility Manual Chapter 6
Cliff Snyder
The secondary nutrients…calcium (Ca), magnesium (Mg), and sulfur (S)…are as important to plant nutrition as the primary nutrients. Calcium stimulates root and leaf development, and affects uptake and activity of other nutrients. Deficiencies of Ca don’t usually occur in field conditions, but can appear in some situations. Magnesium is the central atom in the chlorophyll molecule, so it is actively involved in photosynthesis. The ratio of Mg to potassium (K) can be an important factor related to grass tetany. Sulfur has several key functions in plants, and the need for S is closely related to the amounts of nitrogen (N) available to crop plants. Deficiency symptoms may be similar to those of N, although S is not mobile in plants.
 

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