Table 3.

Nodule number, nodule fresh, and dry weight, N content of soybean root and shoot inoculated with Bradyrhizobium japonicum USDA110.

Treatments*	Nodule number per plant	Nodule fresh weight, g/plant	Nodule dry weight, g/plant	N content, shoot, mg/g plant	N content, root, mg/g plant
HNHP	136.5 ± 45.3d	0.95 ± 0.2c	0.15 ± 0.04d	3.56 ± 0.48b	2.67 ± 0.13bc
HNHMg	186.5 ± 41.0ab	1.40 ± 0.4b	0.38 ± 0.10ab	4.20 ± 0.17a	3.44 ± 0.45a
HNLP	88.7 ± 13.2de	1.10 ± 0.3c	0.21 ± 0.04cd	2.46 ± 0.31de	2.75 ± 0.17bc
HNLMg	154.0 ± 10.8cd	1.12 ± 0.1c	0.21 ± 0.05cd	2.69 ± 0.26cd	2.85 ± 0.09b
LNHP	168.3 ± 18.8b	1.19 ± 0.1c	0.25 ± 0.04cd	2.02 ± 0.13e	2.32 ± 0.28c
LNHMg	189.0 ± 9.7a	1.72 ± 0.3a	0.39 ± 0.06a	3.50 ± 0.21b	2.82 ± 0.33b
LNLP	72.3 ± 8.3e	1.30 ± 0.2bc	0.26 ± 0.07c	2.37 ± 0.20de	2.37 ± 0.21c
LNLMg	101.7 ± 5.6de	1.20 ± 0.3bc	0.29 ± 0.06bc	2.93 ± 0.28c	2.54 ± 0.31bc

Plants were grown for 45 days under hydroponic conditions with nutrient solutions supplemented with combinations of high or low N, P, and Mg concentrations.

^*high N and high P (HNHP), high N and high Mg (HNHMg), high N and low P (HNLP), high N and low Mg (HNLMg), low N and high P (LNHP), low N and high Mg (LNHMg), low N and low P (LNLP), and low N and low Mg (LNLMg). Columns represent means for six plants (N = 6) with standard error bars, and different letters indicate significant differences between treatments at P < 0.05 (Tukey's t-test).