Table 5. Implementation and verification of optimized fertilization.
| Years | Location | Optimal fertilization (kg ha1) | conventional fertilization kg ha1 |
Percentage increase (%) |
|---|---|---|---|---|
| 2016 | Baicheng, Jilin Province | 2,513.2 | 2,151.8 | 16.8 |
| Zhenlai, Jilin Province | 1,795.8 | 1,518.9 | 18.2 | |
| Taikang, Heilongjiang Province | 1,678.5 | 1,376.7 | 21.9 | |
| Average | 1,995.8 | 1,682.5 | 18.6 | |
| 2017 | Baicheng, Jilin Province | 2,392.7 | 2,018.6 | 18.5 |
| Zhenlai, Jilin Province | 1,713.2 | 1,386.9 | 23.5 | |
| Taikang, Heilongjiang Province | 1,581.5 | 1,309.7 | 20.8 | |
| Average | 1,895.8 | 1,571.7 | 20.6 | |
| Two-year average | 1,945.8 | 1,627.1 | 19.6 |