Table 3 Nitrogen input, uptake and surplus for different cropping systems in both 2005 and 2014.
From: Cropping System Conversion led to Organic Carbon Change in China’s Mollisols Regions
Cropping system | N input in 2005 (kg ha−1) | N input in 2014 (kg ha−1) | Interannual T test | N uptake in 2005 (kg ha−1) | N uptake in 2014 (kg ha−1) | Interannual T test | N surplus in 2005 (kg ha−1) | N surplus in 2014 (kg ha−1) |
|---|---|---|---|---|---|---|---|---|
C-C (a) | 146 ± 19.9 | 154 ± 20.1 | ns | 136 ± 16.9 | 139 ± 22.8 | ns | 10.1 | 15.4 |
S-S (b) | 178 ± 6.2 | 180 ± 5.40 | ns | 175 ± 75.8 | 165 ± 27.7 | ns | 3.2 | 14.8 |
S-C (c) | 61.7 ± 39.2 | 131 ± 31.3 | s | 57.6 ± 17.6 | 119 ± 24.3 | s | 4.1 | 12.3 |
