| 氨態(tài)氮/總氮(%) | 得分 | 氨態(tài)氮/總氮(%) | 得分 | |
| <5.0 | 25 | 16.1-18.0 | 9 | |
| 5.1-6.0 | 24 | 18.1-20.0 | 6 | |
| 6.1-7.0 | 23 | 20.1-22.0 | 4 | |
| 7.1-8.0 | 22 | 22.1-26.0 | 2 | |
| 8.1-9.0 | 21 | 26.1-30.0 | 1 | |
| 9.1-10.0 | 20 | 30.1-35.0 | 0 | |
| 10.1-12.0 | 18 | 35.1-40.0 | -3 | |
| 12.1-14.0 | 15 | >40.1 | -6 | |
| 14.1-16.0 | 12 |
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