Table 1. Stocks (g C m−2) of maize-, wheat-derived and total SOC in the 0–40 cm depth.
| Treatment | Urumqi |
Yangling |
Zhengzhou |
Mean (S.D.)* |
||||
|---|---|---|---|---|---|---|---|---|
| 2002 | 2009 | 2002 | 2009 | 2002 | 2009 | 2002 | 2009 | |
| Maize-derived SOC | ||||||||
| Control | 1342 | 1363 | 1215 | 1319 | 1128 | 988 | 1228 (107) | 1223 (205) |
| NPK | 1387 | 1381 | 1273 | 1393 | 1007 | 1144 | 1222 (195) | 1306 (140) |
| NPKS | 1387 | 1428 | 1563 | 2021 | 1394 | 1611 | 1448 (99) | 1686 (304) |
| Wheat-derived SOC | ||||||||
| Control | 2215 | 2206 | 1980 | 2102 | 2175 | 1982 | 2123 (125) | 2097 (112) |
| NPK | 2315 | 2203 | 2257 | 2936 | 2570 | 2773 | 2381 (167) | 2637 (385) |
| NPKS | 2722 | 2717 | 2441 | 3008 | 3011 | 3111 | 2725 (285) | 2945 (204) |
| Total SOC | ||||||||
| Control | 3557 | 3569 | 3195 | 3421 | 3303 | 2969 | 3352 (186) | 3320 (312) |
| NPK | 3701 | 3584 | 3531 | 4330 | 3578 | 3917 | 3603 (88) | 3943 (374) |
| NPKS | 4109 | 4145 | 4004 | 5028 | 4405 | 4721 | 4173 (208) | 4631 (448) |
*Standard deviation.