Table 4. The difference of water use efficiency (millet, rape, and potato) in rotation and continuous cropping during 2008–2010.
| Crop | Cropping pattern | SM | P | WC | Y | WUE | |
|---|---|---|---|---|---|---|---|
| SMI(mm) | SMII(mm) | (mm) | (mm) | (kg ha-1) | (g m-2 mm-1) | ||
| Millet | R | 157.3±3.6 a | 132.5±5.2 a | 278.4±11.1 | 299.8±13.5 a | 9577.5±1888.5 a | 3.16±0.62 a |
| C | 185.5±22.2 a | 175.2±22.4 a | 278.4±11.1 | 288.7±9.4 a | 5048.0±1076.8 b | 1.75±0.37 b | |
| Rapeseed | R | 138.9±8.6 a | 88.4±14.2 a | 279.3±12.0 | 329.8±17.5 a | 1769.5±469.4 a | 0.54±0.15 a |
| C | 119.2±10.2 a | 91.4±14.2 a | 279.3±12.0 | 307.1±21.8 a | 863.4±152.3 b | 0.28±0.05 b | |
| Potato | R | 118.6±22.4 a | 158.7±10.6 a | 290.8±9.4 | 232.5±34.6 a | 17923.0±543.0 a | 7.43±0.98 a |
| C | 165.2±32.2 a | 195.0±17.9 a | 290.8±9.4 | 307.9±26.8 b | 16266.2±1919.6 a | 6.22±0.47 b | |
SM means soil moisture;
SMI means soil moisture before sowing;
SMII means soil moisture in harvest period;
P means precipitation;
WC means water consumption;
Y means yield;
WUE means water useefficiency;
R means rotation cropping;
C means continuing cropping.