Table 5. Change of water quality (DO, pH, temperature, EC, turbidity, TAN, NO2-N, NO3-N and PO4-P) in HP for 12 weeks
Week | DO (mg/L) | pH | Temperature (°C) | EC (μs/cm) | Turbidity (NTU) | TAN (mg/L) | NO2-N (mg/L) | NO3-N (mg/L) | PO4-P (mg/L) |
1 | Not measured |
2 | 9.11 ± 0.17 | 5.89 ± 0.44 | 21.1 ± 1.0 | 821.4 ± 32.6 | 0.98 ± 0.21 | 4.65 ± 0.74 | 0.016 ± 0.006 | 47.93 ± 0.68 | 15.95 ± 0.07 |
3 | 9.04 ± 0.21 | 5.60 ± 0.70 | 22.4 ± 1.5 | 746.8 ± 16.2 | 1.16 ± 0.14 | 4.00 ± 0.68 | 0.019 ± 0.008 | 47.52 ± 0.71 | 14.89 ± 1.30 |
4 | 8.84 ± 0.19 | 5.42 ± 0.20 | 22.0 ± 0.7 | 674.5 ± 19.8 | 0.96 ± 0.08 | 0.54 ± 0.18 | 0.018 ± 0.011 | 43.63 ± 1.94 | 15.97 ± 1.08 |
5 | 8.90 ± 0.13 | 5.45 ± 0.39 | 23.7 ± 1.0 | 681.0 ± 57.9 | 0.50 ± 0.32 | 0.18 ± 0.17 | 0.006 ± 0.002 | 33.17 ± 2.66 | 14.99 ± 0.64 |
6 | 9.18 ± 0.26 | 5.42 ± 0.99 | 23.5 ± 1.2 | 966.3 ± 11.0 | 0.73 ± 0.25 | 1.00 ± 0.27 | 0.016 ± 0.021 | 47.97 ± 0.57 | 15.33 ± 0.22 |
7 | 9.20 ± 0.09 | 5.82 ± 0.01 | 23.1 ± 1.1 | 907.5 ± 7.8 | 1.50 ± 0.49 | 0.19 ± 0.25 | 0.022 ± 0.001 | 38.80 ± 0.14 | 14.78 ± 0.06 |
8 | 9.56 ± 0.07 | 6.06 ± 0.07 | 22.7 ± 0.6 | 762.5 ± 26.2 | 0.95 ± 0.17 | 0.00 ± 0.00 | 0.015 ± 0.008 | 39.42 ± 0.94 | 13.35 ± 1.88 |
9 | 9.10 ± 0.04 | 5.82 ± 0.08 | 23.2 ± 0.0 | 962.0 ± 8.5 | 1.60 ± 0.51 | 3.28 ± 0.06 | 0.036 ± 0.005 | 41.60 ± 3.11 | 15.26 ± 1.05 |
10 | 9.84 ± 0.22 | 5.32 ± 0.33 | 22.5 ± 1.2 | 1,108.0 ± 72.4 | 1.15 ± 0.24 | 2.71 ± 0.50 | 0.050 ± 0.024 | 52.13 ± 1.22 | 13.88 ± 1.75 |
11 | 9.07 ± 0.66 | 5.49 ± 0.54 | 22.1 ± 3.9 | 1,265.8 ± 44.3 | 1.26 ± 0.22 | 0.42 ± 0.35 | 0.005 ± 0.001 | 55.48 ± 1.63 | 14.87 ± 0.38 |
12 | 9.11 ± 0.39 | 5.84 ± 0.35 | 22.4 ± 2.3 | 1,320.8 ± 28.2 | 1.23 ± 0.13 | 0.14 ± 0.10 | 0.006 ± 0.001 | 49.23 ± 5.22 | 14.47 ± 0.29 |
Values represent the mean ± SD of the values for 7 days.
HP, hydroponics; EC, electrical conductivity; TAN, total ammonia nitrogen.