Table 3 Nutrient budget of TN and inorganic nitrogen and water balance.
Control | A | B | C | |
|---|---|---|---|---|
(a) Nitrogen budget (mg) | ||||
Fertilizer (NH4+−N) | 1886 | |||
Total crop (TN) | 266 | 304 | 263 | 246 |
Aboveground | 234 | 269 | 238 | 219 |
Root | 31 | 35 | 25 | 28 |
Soil absorbed (TN) | 3925 | 2805 | 3489 | 2120 |
Initial condition | 24,249 | 24,210 | 24,014 | 24,210 |
Last condition | 28,174 | 27,015 | 27,503 | 26,330 |
Inorganic nitrogen in soil (0–30 cm depth) | 87 | 162 | 126 | 116 |
NO3−−N | 17 | 31 | 12 | 19 |
NH4+−N | 70 | 131 | 114 | 97 |
Inorganic nitrogen in soil (0–95 cm depth) | 114 | 187 | 164 | 140 |
NO3−−N | 34 | 40 | 30 | 32 |
NH4+−N | 80 | 147 | 134 | 109 |
Leachate | 33 | 29 | 37 | 33 |
NO3−−N | 32 | 28 | 34 | 32 |
NH4+−N | 1 | 1 | 3 | 1 |
(b) Water balance (mL) | ||||
Irrigation | 14,850 | |||
Evapotranspiration | 8740 | 10,194 | 9304 | 8930 |
Water in pipe | 6638 | 6678 | 7630 | 6782 |
Drainage | 7332 | 7120 | 7129 | 7234 |
