| Cycle and years | Crop | Most ear type | Middle type (Average) | Biggest ear type | General yield kg/hm2 | Yield ability kg/hm2 | |||||||||
| Density | Number of ear | Seed weight per ear | Plant type | Density | Number of ear | Seed weight per ear | Plant type | Density | Number of ear | Seed weight per ear | Plant type | ||||
| 0 1940 beginning | Corn Rice Wheat Soybean Millet Sorghum | 4.2 40.0 310.0 30.0 60.0 7.5 | 4.0 200.0 350.0 30.0 60.0 7.5 | 70.0 2.5 0.5 8.7 3.8 51.0 | O O O O O O | 3.4 30.0 300.0 22.0 55.0 6.2 | 3.2 140.0 320.0 22.0 55.0 6.2 | 87.5 3.6 0.8 11.8 4.2 61.2 | O O O O O O | 2.9 25.0 230.0 15.0 50.0 5.0 | 2.7 110.0 250.0 15.0 50.0 5.0 | 104.0 4.5 1.1 17.3 4.6 76.0 | O O O O O O | 1700 3700 1600 1700 1600 1800 | 2800 5000 2600 2600 2300 3800 |
| I 1940 - 1970 | Corn Rice Wheat Soybean Millet Sorghum | 5.1 60.0 270.0 30.0 80.0 10.0 | 5.0 480.0 800.0 30.0 80.0 10.0 | 150.0 1.6 1.0 10.0 5.9 60.0 | O O O O O O | 4.6 50.0 150.0 21.0 70.0 9.0 | 4.5 375.0 580.0 21.0 70.0 9.0 | 167.0 2.0 1.3 14.2 6.7 67.0 | O O O O O O | 4.1 40.0 100.0 14.5 60.0 8.0 | 4.0 320.0 350.0 14.5 60.0 8.0 | 187.5 2.4 2.1 20.7 7.8 75.0 | O O O O O O | 5750 6500 6500 2300 3300 4500 | 7500 7500 7500 3000 4700 6000 |
| II 1980 - 2010 | Corn Rice Wheat Soybean Millet Sorghum | 8.0 70.0 200.0 10.0 80.0 15.0 | 7.5 580.0 850.0 55.0* 80.0 15.0 | 213.0 2.1 1.4 11.0 7.1 73.3 | C C C S CD CD | 5.2 55.0 150.0 20.0 70.0 11.5 | 5.0 450.0 600.0 20.0 70.0 11.5 | 320.0 2.7 2.0 30.0 8.1 96.0 | HC HU HU O O O | 4.5 50.0 75.0 10.0 60.0 8.0 | 4.5 300.0 300.0 10.0 60.0 8.0 | 355.0 4.0 4.0 60.0 9.5 137.5 | O O O O O O | 11,000 8700 8600 3000 4500 8500 | 16,000 12,000 12,000 6000 5700 11,000 |
| III 2020 - 2050 | Corn Rice Wheat Soybean Millet Sorghum | 10.0 60.0 200.0 13 - 30 110.0 20.0 | 9.0 750.0 1000.0 75.0* 110.0 20.0 | 244.0 2.3 1.6 10.0 - 13.6 11.0 85.0 | US US US US US US | 6.5 30.0 150.0 20.0 80.0 14.0 | 6.3 500.0 650.0 20.0 80.0 14.0 | 349.2 3.5 2.5 37.5 15.0 121.0 | C HU HU M CD CD | 4.2 15.0 70.0 10.0 60.0 8.0 | 4.2 270.0 300.0 10.0 60.0 8.0 | 523.8 6.5 5.3 75.0 20.0 213.0 | O, HC O, HC O, HC O, HC O, HC O, HC | 16,000 13,000 12,000 4500 8500 12,500 | 22,000 17,500 16,000 7500 12,000 17,000 |