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Plants - just like all forms of life, including human beings - require a complete range of essential elements in order to thrive. Not one can be lacking, or your crops may suffer nutrient deficiencies. Of course, different concentrations of different nutrients are required by plants & animals at different stages of their lives. Just like young, developing children need vitamins & minerals, your plants need a steady supply of calcium & magnesium to ensure vigorous, healthy growth. But even expert growers often overlook another crucial element for high-value crops: specific forms of iron in precise ratios. If you're using our base nutrients, your crops are already getting the correct amounts of CA, Mg & FE. But if you're using our competitors' Base nutrients, your crops could suffer from stunted growth or yellowing leaves. In that case, Use Sensi Cal-Mag extra - the nutrient supplement formulated with the ratios of CA, Mg & FE your crops need.