Table 1.
Initial potting mix and regolith properties, and NH4 concentrations pre- and post-study.
Fig 1.
Linear regression of shoot biomass by nodules (A), root biomass by nodules (B) and remaining and added nitrogen in soil by quantity of nodules (C) for either regolith or potting soil.
NH4 was calculated using the pre-experiment sample for each group and creating a percent for each data point. Data were checked for normality; outliers were removed, and the log scale of the data was taken.
Fig 2.
Sweet clover (Melilotus officinalis) shoot length (A), shoot biomass (B), and root biomass (C) as measured either above or below the root sheath.
Error bars represent standard error of the mean. P-values derived from one-way ANOVA analyses.