| Source | Dependent Variable | Type III Sum of Squares | df | Mean Square | F | Sig. |
| Corrected Model | APCNF | 574.52a | 4 | 143.63 | 9.392 | <0.001 |
| Chemical | 40.68b | 4 | 10.170 | 1.259 | 0.300 | |
| Intercept | APCNF | 12,545.28 | 1 | 12,545.28 | 820.31 | <0.001 |
| Chemical | 1971.92 | 1 | 1971.92 | 244.18 | <0.001 | |
| Agroecological zone | APCNF | 574.52 | 4 | 143.63 | 9.392 | <0.001 |
| Chemical | 40.68 | 4 | 10.170 | 1.259 | 0.300 | |
| Error | APCNF | 688.20 | 45 | 15.29 | ||
| Chemical | 363.40 | 45 | 8.07 | |||
| Total | APCNF | 13,808.00 | 50 | |||
| Chemical | 2376.00 | 50 | ||||
| Corrected Total | APCNF | 1262.72 | 49 |
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| Chemical | 404.08 | 49 |
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