In the present work slow-release phosphorus fertilizers were prepared by formation of crosslinked acrylic acid networks, modified by poly(ethylene glycol). The effect of polymerization conditions on swelling capacity was investigated. The results showed that the swelling capacity was affected by concentration of the fertilizer and amount of poly(ethylene glycol). Morphological analysis (SEM) shows the large surface of the hydrogels matrix. Besides, relationship between the release profiles and swelling capacity was observed. The influence of PEG macrochains in the polymer networks on fertilizer ions migration from hydrogel matrix to water has been discussed.
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Tyliszczak et al. (2010) studied this question.
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