Starch-Grafted Sodium Alginate-Modified Clay Composites as Environmentally Controlled-Release Materials for NPK Fertilizer

Figure 8

FTIR spectra of biodegradation of ST-g-SAG/Ca-MMT/NPK for 0 month (a), 1 month (b), 2 months (c), 3 months (d), 4 months (e), 5 months (f), and 6 months (g).