Experiments Model G U NS10 L10 L20 NS20 First order model 0.9165 0.9916 0.9768 0.9451 0.9547 0.9093 Active surface model 0.8313 0.9873 0.9363 0.9859 0.9841 0.7710 Gel layer model 0.9660 0.9905 0.9779 0.9542 0.9621 0.9844

Table 5: Goodness of fit: R2 value. G=Grinded KCl; U=Ungrinded KCl; NS10=Native Starch 10%; L10=Lignin 10%; L20=Lignin 20%; NS20=Native Starch 20%.