TABLE 1.
Average C:N ratios (±1 SE) of root and shoot tissues in different cover crop (CC) treatments over the 7‐year organic grain crop‐CC rotation
| Functional type | CC treatment | Shoot C:N | Composite root C:N a | ||||
|---|---|---|---|---|---|---|---|
| Fall | Spring | Average | Fall | Spring | Average | ||
| Grass | Triticale | 18.3 (0.79) | 25.9 (2.03) | 22.1 (1.41) | 35.5 (0.78) | 40.6 (0.73) | 38.1 (0.76) |
| Brassica | Canola | 17.9 (0.86) | 24.3 (1.23) | 21.1 (1.04) | 23.7 (0.62) | 36.8 (0.79) | 30.2 (0.71) |
| Legume | Crimson clover | 12.7 (0.47) | 12.8 (0.32) | 12.8 (0.40) | 16.9 (0.64) | 15.9 (0.40) | 16.4 (0.56) |
| Mixture | 5Spp.Mix | 13.8 (0.92) | 15.4 (0.48) | 14.6 (0.70) | 21.0 (1.40) | 30.8 (1.38) | 25.9 (1.39) |
a
The composite root C:N ratios were only measured in fall 2016 and spring 2017.