对控释肥料养分释放的测定方法、释放机理和及其影响因素作了简要阐述，并指出研究中存在的问题和最新进展。
It briefly formulizes the measuring method, the release principle and the effect factors on the nutrient release of CRFs, and points out the existing problems and the newest development.
体外释放研究表明，聚酸酐的溶蚀是控释的机理。
In vitro release study showed that polyanhydride erosion is the mechanism of drug controlled release.
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