The testing Least Significant Difference (LSD) value may help to eliminate that perceived difference outlier.social port said:... As far as seeing a difference between a cultivar rated at 7.3 vs one at 8.7-I don't know. I've been told by seed distributors that there is no perceptible difference. On the other hand, I do assume that there are valid reasons for differences in ratings. ...
http://www.ntep.org/interpat.htm