3.5 Relationships of KDD with KN/ear
The killing degree days (KDD) on average were significantly lower in the first sowing date (Mar. 21 in 2015 and 2016) than in the second sowing date (Apr. 28 in 2015 and May 24 in 2016), with larger differences in 2016 (Figure 4). KDD were all significantly higher in Tr than in Te and Te×Tr at two sowing dates in both 2015 and 2016.
The correlation analysis between KDD and KN/ear were performed (sowing date1, Figure 5A; sowing date 2, Figure 5B). KDD was not significantly correlated with KN/ear at Te and Tr group in SD1, except at Te×Tr group. However, the correlation between KDD and KN/ear at each of Te, Tr, and Te×Tr group were all significantly negative in SD2 with higher correlation coefficients for Tr and Te×Tr groups than for Te group.