Table 3.
Soil organic carbon, total nitrogen, and mineral nitrogen contents averaged over farmers’ fields in 2014.
| Cropping system |
|||
|---|---|---|---|
| Tillage system | CMZ | SB–MZ | Mean |
| Organic carbon (g kg-1) | |||
| CT | 3.68aA | 4.02aA | 3.85A |
| NT | 4.04aA | 3.90aA | 3.97A |
| Mean | 3.86a | 3.96a | |
| Total nitrogen (g kg-1) | |||
| CT | 0.33aA | 0.36aA | 0.34A |
| NT | 0.36aA | 0.35aA | 0.35A |
| Mean | 0.34a | 0.35a | |
| Mineral nitrogen (mg kg-1) | |||
| CT | 20.6aA | 23.0aA | 21.8A |
| NT | 20.3aA | 23.1aA | 21.7A |
| Mean | 20.5a | 23.0a | |
CT, conventional tillage; NT, no-tillage; CMZ, continuous maize; SB–MZ,
soybean–maize rotation.
Means within a column followed by similar upper case letters are not significantly different.
Means within a row followed by similar lower case letters are not significantly different.