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

Table 2

Experimental design matrix.

Run	Factor 1; MWCNTs (wt%)	Factor 2; Functionalization; reflux time (hour)
1	0.6	18.00
2	0.3	18.00
3	0.3	24.00
4	0.3	18.00
5	0.3	18.00
6	0.3	12.00
7	0.5	21.00
8	0.1	15.00
9	0.2	18.00
10	0.1	21.00
11	0.3	18.00
12	0.5	15.00
13	0.3	18.00