highly significantP<0.001
The comparison of the 1976 P2004 and 2003 P2004 samples revealed highly significant differences in flowering time (F 1,1806 = 19.6, P<0.001), plant height (F 1,1806 = 23.3, P<0.001) and spike length (F 1,1806 = 9.4, P≤0.002) between samples.