Table 1. The distribution of types of yield trend across major cereals and farming systems in China, 1980–2010.
| Farming system | % of national harvest area | Yield trend | |||
|---|---|---|---|---|---|
| CO | NI | SI | ST | ||
| Rice | |||||
| Lowland rice system | 59.7 | 0.2 | 4.7 | 22.3 | 32.5 |
| Temperate mixed system | 19.0 | 0.2 | 0.8 | 10.6 | 7.4 |
| Upland intensive-temperate | 2.2 | 0.0 | 0.1 | 1.2 | 0.9 |
| Upland intensive-sub tropical | 16.9 | 0.0 | 1.7 | 6.5 | 8.7 |
| Highland mixed | 1.6 | 0.0 | 0.0 | 1.2 | 0.4 |
| System total (%) | 99.6 | 0.4 | 7.4 | 41.8 | 50.0 |
| System total (Harvest area, M ha) | 29.3 | 0.1 | 2.2 | 12.3 | 14.7 |
| Wheat | |||||
| Lowland rice | 51.6 | 0.3 | 7.7 | 37.3 | 6.3 |
| Temperate mixed system | 23.3 | 0.6 | 1.6 | 14.4 | 6.7 |
| Upland intensive-temperate | 9.1 | 0.4 | 2.4 | 4.9 | 1.4 |
| Upland intensive-sub tropical | 3.9 | 0.4 | 1.3 | 1.4 | 0.8 |
| Highland mixed | 1.1 | 0.1 | 0.3 | 0.2 | 0.5 |
| System total (%) | 89.1 | 1.8 | 13.3 | 58.2 | 15.8 |
| System total (Harvest area, M ha) | 21.2 | 0.4 | 3.2 | 13.8 | 3.8 |
| Maize | |||||
| Lowland rice | 15.7 | 0.5 | 4.1 | 3.8 | 7.3 |
| Temperate mixed system | 62.9 | 0.7 | 13.7 | 7.2 | 41.3 |
| Upland intensive-temperate | 9.4 | 0.3 | 3.1 | 1.8 | 4.2 |
| Upland intensive-sub tropical | 4.8 | 0.0 | 0.5 | 3.4 | 0.9 |
| Highland mixed | 2.1 | 0.0 | 0.2 | 1.4 | 0.5 |
| System total (%) | 95.3 | 1.6 | 21.7 | 17.7 | 54.3 |
| System total (Harvest area, M ha) | 28.6 | 0.5 | 6.5 | 5.3 | 16.3 |
CO = yield collapsed, NI = yield not improved, SI = yield still increasing, ST = yield stagnated