Table 3 Effects of no-till (NT) and conventional tillage (CT) over time on carbon (C) and nitrogen (N) stocks in bulk soil, as well as carbon in mineral-associated organic matter (MAOM), within a winter wheat–spring pea (WW-SP) system at a 30 cm soil depth. Mean values ± standard deviation (SD) (n = 4) are presented. Statistical analysis was conducted using a two-way ANOVA. A post hoc Tukey HSD test was performed for multiple comparisons, with different lowercase letters indicating significant differences (p < 0.05) among soil variables within the cropping system. The P × T interaction represents the combined effect of tillage (T) practices and time (Y).
From: Legume-based rotation enhance long-term soil carbon storage in eastern Oregon dryland wheat systems
Treatment (T) | Time (Y) | C stock | N stock | MAOM C stock | |||
|---|---|---|---|---|---|---|---|
t C ha yr−1 | t N ha yr−1 | t C ha yr−1 | |||||
NT WW-SP | 1985 | 47.7 ± 0.2ab | 4.2 ± 0.0 a | 44.7 ± 0.1ab | |||
1995 | 48 ± 4.4ab | 4.3 ± 0.32a | 42.2 ± 1.9b | ||||
2005 | 46.3 ± 4.1ab | 4.2 ± 0.4a | 42.2 ± 1.2b | ||||
2010 | 49.2 ± 3.9ab | 4.5 ± 0.42a | 45.6 ± 2.1ab | ||||
2021 | 53.2 ± 2.4a | 4.4 ± 0.4a | 47.3 ± 1.1a | ||||
CT WW-SP | 1985 | 42.3 ± 2.5b | 3.8 ± 0.2a | 41.6 ± 0.7b | |||
1995 | 47.3 ± 3.2ab | 4.2 ± 0.3a | 44.3 ± 1.0ab | ||||
2005 | 44.8 ± 5.1ab | 4.1 ± 0.3a | 42.4 ± 3.5ab | ||||
2010 | 46.2 ± 3.7 ab | 4.2 ± 0.3a | 42.5 ± 0.4ab | ||||
2021 | 47.5 ± 1.0ab | 4.1 ± 0.3a | 42.8 ± 0.7ab | ||||
F-value | P value | F-value | P value | F-value | P value | ||
Treatment | 6.48 | 0.02 | 4.31 | 0.05 | 10.23 | 0.00 | |
Time | 2.42 | 0.09 | 1.005 | 0.43 | 2.19 | 0.11 | |
T × Y | 0.59 | 0.67 | 0.185 | 0.94 | 2.10 | 0.12 | |
