Application of Response Surface Methodology for Optimization of Urea Grafted Multiwalled Carbon Nanotubes in Enhancing Nitrogen Use Efficiency and Nitrogen Uptake by Paddy Plants

Figure 7

3D response surface plot of NUE (a) and NU (c) coupled with contour plots of NUE (b) and NU (d) of paddy as a function of f-MWCNTs (%) and functionalization reflux time (hour).

(a)

(b)

(c)

(d)