Table 3.

Correlation coefficients among the 11 agronomic traits studied across two normal-N and two low-N conditions

	Chl1	Chl2	Chl3	PH	AD	MC1	MC2	BY	GY	TGW	GS
Chl1		0.67***	0.43***	−0.34***	−0.24**	0.056	−0.20**	−0.023	0.081	−0.17*	0.16*
Chl2	0.74***		0.68***	−0.43***	−0.35***	−0.008	−0.23**	−0.029	0.115	−0.071	0.19**
Chl3	0.42***	0.66***		−0.42***	−0.035	0.123	0.103	0.047	0.112	−0.109	0.088
PH	−0.51***	−0.56***	−0.57***		0.049	0.023	−0.20**	0.44***	0.27***	0.41***	−0.088
AD	−0.47***	−0.39***	0.07	0.23**		0.20**	0.67***	0.15*	0.033	−0.29***	−0.16*
MC1	0.14	0.1	0.19**	−0.08	0.05		0.24**	0.056	0.081	−0.023	0.111
MC2	−0.07	−0.12	0.23**	−0.11	0.39***	0.40***		−0.052	−0.27***	−0.39***	−0.48***
BY	−0.43***	−0.40***	−0.30***	0.74***	0.33***	−0.03	−0.07		0.81***	0.18*	0.081
GY	−0.26**	−0.16*	−0.19**	0.54***	0.14*	−0.13	−0.43***	0.80***		0.25**	0.58***
TGW	−0.38***	−0.33***	−0.16*	0.39***	0.25**	−0.05	0.04	0.45***	0.33***		0.23**
GS	0.29***	0.28***	0.107	−0.16*	−0.32***	−0.05	−0.41***	−0.11	0.27***	−0.08

Correlation coefficients were calculated from the trait values averaged over two years (2011 and 2012). The numbers below the diagonal are correlation coefficients under normal N treatments and numbers above the diagonal are correlation coefficients under low N treatments. Chl1, Chl2, Chl3, chlorophyll contents (at vegetative, anthesis, and maturity stages); PH, plant height (cm); AD, days to anthesis; MC1, % stover moisture content; MC2, % head moisture content; BY, biomass yield (t. ha⁻¹); GY, grain yield (t. ha⁻¹); TGW, thousand grain weight (g); GS, grain-to-stover ratio (%). ***P < 0.0001; **P < 0.01; *P < 0.05