Preparation and properties of corn stover cellulose-based water-retaining and slow-release fertilizer
A degradable superabsorbent polymer of corn stover cellulose graft polyacrylic acid(CSC-g-PAA)by solution polymerization using corn stover cellulose(CSC)and acrylic acid(AA)as raw materi-als.The structure and morphology of CSC-g-PAA were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR)and thermogravimetric analysis(TGA).The water holding,water retention and degradability of CSC-g-PAA in soil were studied.The results showed that the water absorption rate of CSC-g-PAA in deionized water could reach 702.89 g/g,and that of CSC-g-PAA after five cycles was about 47.27％of the initial water absorption rate;the water holding rate of soil con-taining CSC-g-PAA content of3％was70.51％,and after 36 d,the water retention rate was 15.50％;the degradation rate of CSC-g-PAA was 24.14％after 50 d.The maximum loading rate of urea by liquid im-pregnation method is 81.76％.CSC-g-PAA Loaded with urea has slow-release effect on the release of urea in deionized water,and its slow-release performance accords with Mt/M∞=Ktn model.Obviously,CSC-g-PAA can integrate the functions of water absorption,water retention,nutrient loading and slow release,which has great potential of saving water,reducing fertilizer application and increasing efficiency in agri-cultural production.
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