Research Article
Trends in Moisture Index, Farmland Area, and Their Combined Effects on Grain Production in Northern China
Table 4
Grain production in the late 1980s and 2008.
| Grain production | The late 1980s | 2008 | Percent increase (%) (late 1980s–2008) | Tons | Percent (%) | Tons | Percent (%) |
| Humid zone | 122,799,081 | 77.1 | 188,532,597 | 58.9 | 53.5 | Semiarid zone | 28,875,900 | 18.1 | 115,976,814 | 36.2 | 301.6 | Arid zone | 7,622,100 | 2.4 | 15,490,026 | 4.8 | 103.2 |
| Total | 159,297,081 | 100 | 319,999,437 | 100 | 100.9 |
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