| Crop | Threshold (a); mol/m3 | Slope (a); %per mol/m3 |
|---|---|---|
| Strawberry | 10 | 3.3 |
| Bean | 10 | 1.9 |
| Onion | 10 | 1.6 |
| Carrot | 10 | 1.4 |
| Radish | 10 | 1.3 |
| Lettuce | 10 | 1.3 |
| Turnip | 10 | 0.9 |
| Rice, paddy (b) | 30 (c) | 1.2 (c) |
| Pepper | 15 | 1.4 |
| Clover, strawberry | 15 | 1.2 |
| Clover, red | 15 | 1.2 |
| Clover, alsike | 15 | 1.2 |
| Clover, ladino | 15 | 1.2 |
| Corn | 15 | 1.2 |
| Flax | 15 | 1.2 |
| Potato | 15 | 1.2 |
| Sweet potato | 15 | 1.1 |
| Broadbean | 15 | 1.0 |
| Cabbage | 15 | 1.0 |
| Foxtail, meadow | 15 | 1.0 |
| Celery | 15 | 0.6 |
| Clover, Berseem | 15 | 0.6 |
| Orchardgrass | 15 | 0.6 |
| Sugarcane | 15 | 0.6 |
| Trefoil, big | 20 | 1.9 |
| Lovegrass | 20 | 0.8 |
| Spinach | 20 | 0.8 |
| Alfalfa | 20 | 0.7 |
| Sesbania (b) | 20 | 0.7 |
| Cucumber | 25 | 1.3 |
| Tomato | 25 | 1.0 |
| Broccoli | 25 | 0.9 |
| Squash, scallop | 30 | 1.6 |
| Vetch, common | 30 | 1.1 |
| Wildrye, beardless | 30 | 0.6 |
| Sudangrass | 30 | 0.4 |
| Wheatgrass, standard crested | 35 | 0.4 |
| Beet, red (b) | 40 | 0.9 |
| Fescue, tall | 40 | 0.5 |
| Squash, zucchini | 45 | 0.9 |
| Hardinggrass | 45 | 0.8 |
| Cowpea | 50 | 1.2 |
| Trefoil, narrow-leaf birdsfoot | 50 | 1.0 |
| Ryegrass, perennial | 55 | 0.8 |
| Wheat, Durum | 55 | 0.5 |
| Barley (forage) (b) | 60 | 0.7 |
| Wheat (b) | 60 | 0.7 |
| Sorghum | 70 | 1.6 |
| Bermudagrass | 70 | 0.6 |
| Sugarbeet (b) | 70 | 0.6 |
| Wheatgrass, fairway crested | 75 | 0.7 |
| Cotton | 75 | 0.5 |
| Wheatgrass, tall | 75 | 0.4 |
| Barley (b) | 80 | 0.5 |