Table III. Correlation coefficients between root and plant growth parameters in nonself cropping combinations when planting distance was 5 × 5 cm.

HX3/NE1 and HX3/GZ1 presented for soybean HX3 intercropped with maize NE1 and GZ1, respectively. Harvest I and II were 15 and 60 d after sowing, respectively. **, Significant at P < 0.01; *, significant at P < 0.05; ns, not significant at P < 0.05.

R Value	Day	Gel Experiment				Field Experiment
		HX3/NE1		HX3/GZ1		Harvest I				Harvest II
						HX3/NE1		HX3/GZ1		HX3/NE1		HX3/GZ1
		Biomass	P Content	Biomass	P Content	Biomass	P Content	Biomass	P Content	Biomass	P Content	Biomass	P Content
Total root length (cm)	6th	0.9541**	0.8924*	0.9952**	0.9366*	0.9797**	0.7510 ns	0.9528*	0.8372*	0.8669*	0.8667*	0.9438*	0.9672*
	12th	0.9268**	0.8881*	0.9169*	0.9131*	0.9652*	0.8662*	0.9198*	0.7741 ns	0.8626*	0.9491*	0.9487*	0.9859**
	18th	0.9668**	0.9062*	0.9613**	0.8604*	0.9411*	0.7402 ns	0.8811*	0.7801 ns	0.7249 ns	0.8498*	0.9777**	0.9699*
Relative root length in 0- to 5-cm layer (%)	6th	−0.5659ns	−0.6568 ns	0.9141*	0.7135 ns	0.5628 ns	0.6459 ns	0.7432 ns	0.7265 ns	0.1391 ns	0.5900 ns	0.8871*	0.8452*
	12th	−0.4231ns	−0.6076 ns	0.9692**	0.9268**	0.4486 ns	0.4711 ns	0.9390*	0.8101 ns	−0.0645 ns	0.5110 ns	0.9556*	0.9856**
	18th	−0.6276	−0.7914 ns	0.9894**	0.8810*	0.6551 ns	0.6897 ns	0.9004*	0.8287*	0.3079 ns	0.7679 ns	0.9285*	0.9347*