Table 1 Pearson’s correlation coefficients between the three traits, tiller number (TN), root biomass (RB), and shoot biomass (SB) evaluated at maximum tillering stage (MT) in the 2017GH and 2018GH studies as well as at harvest stage (H) in the 2017F study.

Trait	Environ	Stage	Tiller number (TN)			Root biomass (RB)		Shoot biomass (SB)
			2017GH	2018GH	2017F	2017GH	2018GH	2017GH	2018GH	2017F
			MT	MT	H	MT	MT	MT	MT	H
TN	2017GH	MT	1.00	0.62***	0.34***	0.52***	0.22**	0.37***	0.08^ns	0.10^ns
	2018GH	MT		1.00	0.35***	0.35***	0.44***	0.21**	0.35***	0.13*
	2017F	H			1.00	0.18**	0.17**	0.08^ns	0.05^ns	0.84***
RB	2017GH	MT				1.00	0.46***	0.53***	0.23***	0.16*
RB	2018GH	MT					1.00	0.17*	0.45***	0.27***
SB	2017GH	MT						1.00	0.40***	0.10^ns
	2018GH	MT							1.00	0.10^ns
	2017F	H								1.00

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