Table 3. Variations in two-factor (BC × soil type) ANOVA of root morphology in two growth stages.

Stage	Source of variation	df	P value
			Root length	Specific root length	Root surface area	Specific root surface area	Root volume	Average root diameter
Bud stage	Soil type	1	<0.0001**	0.004**	0.236ns	<0.0001**	0.001**	<0.0001**
	BC	2	<0.0001**	0.902ns	0.163ns	0.011*	0.034*	<0.0001**
	Soil type × BC	2	0.001**	0.605ns	0.028*	0.962ns	0.883ns	<0.0001**
Harvesting stage	Soil type	1	<0.0001**	0.013*	0.366ns	<0.0001**	<0.0001**	<0.0001**
	BC	2	<0.0001**	0.993ns	0.008**	<0.0001**	<0.0001**	<0.0001**
	Soil type × BC	2	<0.0001**	0.594ns	0.253ns	0.016*	0.537ns	<0.0001**

Notes.

^nsP ≥ 0.05.

^*0.01 ≤ P < 0.05.

^**P < 0.01.