ENSI CAL-MAG XTRA Feed Your Crops the Extra Calcium Magnesium and Iron They Need If You Use a Non-Advanced Base Nutrient 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 and animals at different stages of their lives. Just like young developing children need vitamins and minerals your plants need a steady supply of calcium and 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 youre using our base nutrients your crops are already getting the correct amounts of Ca Mg and Fe.