Characteristics of Organic Acid Secretion Associated with the Interaction between Burkholderia multivorans WS-FJ9 and Poplar Root System

Table 1

Experimental nutrient solution.

	0-P	Low-P	Normal-P	High-P
CaNO3·4H2O/mg	945	945	945	945
KNO3/mg	506	506	506	506
NH4NO3/mg	80	80	80	80
KH2PO4/mg	0	68	136	272
KCl/mg	74.6	37.3	0	0
Ferrous salt solution/mL	2.5	2.5	2.5	2.5
Trace element solution/mL	5	5	5	5
Water/mL	1000	1000	1000	1000
pH	6.8	6.7	6.6	6.4

Ferrous salt solution: 2.78 g of FeSO₄·7H₂O, 3.73 g of Na-EDTA, dissolved in 500 mL of distilled water.
Trace element solution: containing 0.83 mg·L^–1 KI, 6.2 mg·L^–1 H₃BO₃, 0.25 mg·L^–1 MnSO₄·H₂O, 8.6 mg·L^–1 ZnSO₄, 0.25 mg·L^–1 Na₂MoO₄·2H₂O, 0.025 mg·L^–1 CuSO₄·5H₂O, and 0.025 mg·L^–1 CoCl₂·6H₂O.