Table 2.

Correlation coefficients of GPC between two methods and between different years from 280 RILs.

	16NIRS	16KND	17NIRS
16KND	0.966 **
17NIRS	0.638 **	0.651 **
17KND	0.614 **	0.631 **	0.983 **

16NIRS, 17NIRS: GPC of 280 RILs in 2016 and 2017 measured by near infrared reflectance spectroscopy (NIRS); 16KND, 17KND: GPC of 280 RILs in 2016 and 2017 measured by Kjeldahl nitrogen determination (KND). ** highly significant correlations at the 0.01 level.