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Table 1 Mean and standard deviation values of physical and chemical variables analysed during the study period in Zacarés rice fields
| Field | N | n | Cond (μS·cm−1) | Sal (g·L−1) | O2(%) | WT (°C) | pH | Cl−(mg·L−1) | Alk/Cl− | PO4 3−(mg·L−1) | NO3 −(mg·L−1) | NO2 −(mg·L−1) | NH4 +(mg·L−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 5 | 3 | 2,376 ± 34 | 1.2 ± 0.0 | 93.5 ± 29.4 | 25.8 ± 0.6 | 8.2 ± 0.7 | 296 ± 33 | 0.65 ± 0.20 | 0.06 ± 0.00 | 31.5 ± 2.8 | 0.12 ± 0.47 | 1.70 ± 0.18 |
| B | 6 | 4 | 2,906 ± 402 | 1.5 ± 0.2 | 138.2 ± 23.2 | 29.8 ± 2.6 | 8.8 ± 0.5 | 436 ± 70 | 0.38 ± 0.15 | 0.00 ± 0.00 | 33.7 ± 11.0 | 0.05 ± 0.04 | 0.58 ± 0.10 |
| C | 4 | 4 | 1,980 ± 184 | 1.0 ± 0.1 | 94.3 ± 42.1 | 27.8 ± 3.5 | 8.3 ± 0.1 | 209 ± 31 | 0.82 ± 0.26 | 0.00 ± 0.00 | 38.3 ± 12.5 | 0.71 ± 1.12 | 0.35 ± 0.13 |
| D | 4 | 4 | 2,503 ± 749 | 1.3 ± 0.4 | 112.5 ± 13.6 | 30.6 ± 2.3 | 8.7 ± 0.5 | 316 ± 70 | 0.64 ± 0.44 | 0.10 ± 0.20 | 33.7 ± 11.0 | 0.03 ± 0.00 | 0.35 ± 0.19 |
| E | 3 | 3 | 1,631 ± 218 | 0.8 ± 0.1 | 109.3 ± 50.9 | 29.8 ± 3.7 | 8.6 ± 0.2 | 152 ± 60 | 0.99 ± 0.02 | 0.00 ± 0.00 | 28.3 ± 14.1 | 0.33 ± 0.27 | 0.27 ± 1.27 |
| F | 4 | 3 | 2,610 ± 337 | 1.3 ± 0.2 | 128.6 ± 57.2 | 29.0 ± 1.4 | 8.5 ± 0.4 | 331 ± 61 | 0.48 ± 0.17 | 0.17 ± 0.14 | 25.0 ± 8.6 | 0.11 ± 0.12 | 0.97 ± 0.90 |
| G | 3 | 2 | 3,393 ± 1,034 | 1.8 ± 0.5 | 89.6 ± 33.5 | 29.9 ± 2.0 | 8.2 ± 0.2 | 448 ± 200 | 0.47 ± 0.40 | 0.17 ± 0.00 | 26.6 ± 11.5 | 0.19 ± 0.03 | 0.77 ± 0.12 |
| H | 2 | 1 | 1,845 ± 50 | 0.9 ± 0.0 | 161.0 ± 24.7 | 29.1 ± 0.1 | 8.5 ± 0.1 | 177 ± 3 | 0.73 ± 0.21 | 0.07 ± 0.07 | 30.0 ± 0.0 | 0.78 ± 0.18 | 0.05 ± 0.00 |
| I | 6 | 2 | 2,376 ± 410 | 1.2 ± 0.2 | 93.5 ± 23.5 | 25.8 ± 0.6 | 8.2 ± 0.3 | 296 ± 58 | 0.65 ± 0.19 | 0.06 ± 0.14 | 31.5 ± 12.8 | 0.12 ± 0.04 | 1.70 ± 0.29 |
| J | 4 | 3 | 2,506 ± 548 | 1.2 ± 0.3 | 83.7 ± 30.6 | 25.4 ± 1.0 | 8.3 ± 0.2 | 344 ± 141 | 0.53 ± 0.43 | 0.00 ± 0.00 | 33.0 ± 4.6 | 0.03 ± 0.04 | 0.53 ± 0.40 |
