EDTA Iron
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Iron is an essential nutrient for plant growth. However, if you put a simple iron compound such as iron nitrate in your solution, it will form a precipitate with other chemicals in the solution such as phosphate. To avoid this, you must use chelated iron. A chelating agent is a molecule that grabs onto an ion such as iron and holds it tightly so that it cannot precipitate. However, plants still have ways of extracting the iron they need from these compounds. EDTA iron is one type of chelated iron that you can use in a nutrient solution.
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