| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Beta vulgaris | Leaf | 321.0 | 439.0 | 0.4 | Jim Duke's personal files.* |
| Brassica oleracea var. gemmifera | Leaf | 4.0 | 63.0 | -0.9 | * |
| Brassica rapa | Oil | -- | 189.0 | -0.4 | * |
| Brassica oleracea var. botrytis l. | Flower | 0.3 | 4.0 | -1.0 | * |
| Brassica oleracea var. italica | Leaf | 7.0 | 439.0 | 0.4 | * |
| Brassica oleracea var. sabellica l. | Leaf | 359.0 | 785.0 | 1.5 | * |
| Brassica oleracea var. botrytis l. | Leaf | 7.0 | 439.0 | 0.4 | * |
| Brassica pekinensis | Leaf | 2.0 | 56.0 | -0.9 | * |
| Brassica rapa | Leaf | 2.0 | 56.0 | -0.9 | * |
| Brassica oleracea var. capitata l. | Leaf | 0.4 | 170.0 | -0.6 | * |
| Brassica chinensis | Leaf | 2.0 | 56.0 | -0.9 | * |
| Brassica oleracea var. sabellica l. | Stem | 9.0 | 16.0 | * | |
| Calendula officinalis | Leaf | -- | -- | * | |
| Capsicum annuum | Fruit | 22.0 | 284.0 | 3.2 | * |
| Carica papaya | Leaf | -- | -- | Jim Duke's personal files. | |
| Carthamus tinctorius | Oil | -- | 449.0 | -0.0 | * |
| Citrus paradisi | Fruit | 3.0 | 29.0 | -0.7 | * |
| Citrus sinensis | Fruit | 4.0 | 29.0 | -0.7 | * |
| Citrus reticulata | Fruit | 3.0 | 31.0 | -0.6 | * |
| Cocos nucifera | Oil | -- | 18.0 | -0.7 | * |