Slow-released NPK fertilizer encapsulated by NaAlg-g-poly(AA-co-AAm)/MMT superabsorbent nanocomposite.

A novel slow released NPK fertilizer encapsulated by superabsorbent nanocomposite was prepared via in-situ free radical polymerization of sodium alginate, acrylic acid, acrylamide, and montmorillonite in the presence of fertilizer compounds. Evidence of grafting and component interactions, superabsorbent nanocomposite structure and morphology was obtained by a FT-IR, XRD and SEM techniques. The water absorbency behavior of superabsorbent nanocomposite was investigated. After those characterizations, the potential application was verified through the study of fertilizer release from prepared formulations. Results indicated that the presence of the montmorillonite caused the system to liberate the nutrient in a more controlled manner than that with the neat superabsorbent. The good slow release fertilizer property as well as good water retention capacity showed that this formulation is potentially viable for application in agriculture as a fertilizer carrier vehicle.