Table 4.
Predicted increase in mean Pb concentrations in produce compared to potatoes grown in soil from Residence 1 when the mean concentration of bioavailable Pb in soil increases by 100 ug g−1.
| Produce | Predicted Change in Mean Pb (ug g−1) |
p > ∣t∣ |
|---|---|---|
| Radish | 6.9 ± 1.5 | <0.0001 |
| Carrot | ||
| White | 6.8 ± 1.4 | <0.0001 |
| Purple | 4.3 ± 1.8 | 0.0204 |
| Orange | 3.1 ± 1.1 | 0.0044 |
| Turnip Bulb | 6.0 ± 1.5 | <0.0001 |
| Turnip Leaf | 2.2 ± 1.4 | 0.1232 |
| Beetroot Bulb | ||
| Bulls Blood | 3.3 ± 1.2 | 0.0092 |
| Chioggia | 2.9 ± 1.4 | 0.0421 |
| Beetroot Leaf | ||
| Bulls Blood | 1.7 ± 1.2 | 0.1772 |
| Potato | 0.9 ± 1.0 | 0.349 |
Note. As noted on Table S2 and reflected in the table above, the predicted increase in the mean Pb concentration in potatoes grown in soil from Residence 1 is 0.9 ± 1.0 ug g−1 when the mean concentration of bioavailable Pb in soil increases by 100 ug g−1. Predicted changes in mean Pb concentrations in other produce tissues given in the table are relative to the change in the mean Pb concentration in potatoes. T-values for each simple slope are given on Table S2 and p-values summarized above are based on 164 degrees of freedom. The simple slopes of additional beetroot cultivar bulbs and leaves; the simple slope of tomato; and the simple slope of pepper are not significantly different from potatoes (p > 0.25; Table S2) and are omitted from this table.