Iron chelate, also known as chelated iron, is a soluble complex of iron, sodium and a chelating agent such as ethylenediaminetetraacetate (EDTA), EDDHA, or others, used to make the iron soluble in water and, for the purposes of agriculture, accessible to plants. It is encountered as a dark brownish powder, and can be a mild irritant to the skin, r...
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http://en.wikipedia.org/wiki/Iron_chelate
This is often recommended when plants are showing signs of chlorosis. It is a form of iron, being readily absorbed by plants, especially in alkaline soils.
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http://www.encyclo.co.uk/local/20077
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