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

Figure 5

Conductivity of active NPK with time for NPK (a), Ca-MMT/NPK (b), ST-g-SAG/NPK (c), and ST-g-SAG/Ca-MMT(5%)/NPK (d).

(a)

(b)

(c)

(d)