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Ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) are the chelating compounds most often used in the production of liquid fertilizers, but they are said to be insufficiently biodegradable and to accumulate in the environment for as long as 15 years. Therefore it is necessary to search for compounds which would both have good complexing properties and be readily biodegradable...
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