Superabsorbent hydrogels as carriers for the controlled-release of urea: Experiments and a mathematical model describing the release rate

Hydrogel, prepared by swelling superabsorbent in a urea solution and used as carrier for controlled-release, can significantly reduce the leaching losses of urea. Static release experiments showed that the size and the degree of crosslinking of the hydrogel had a significant effect on the release ra...

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