Research Article
Nitrate-Nitrogen Leaching from Onion Bed under Furrow and Drip Irrigation Systems
Table 7
Mean and standard errors for NO3-N, chloride, and water balance during two onion growing seasons (2006–08) in drip-irrigated onion field in NM.
| | | Drip-irrigated field (2006-07) | Drip-irrigated field (2008) | | | Nitrate-N (kg ha−1) | Chloride (kg ha−1) | Water cm | Nitrate-N (kg ha−1) | Chloride (kg ha−1) | Water cm |
| | 1 | Total applied | 292 | 486 | 81 | 286 | 396 | 72 | | 2 | Deep percolated (>50 cm depth) | 79 ± 6.9 | 298 ± 11.3 | 14 ± 1.77 | 76 ± 0.27 | 245 ± 5.6 | 12.5 ± 0.8 | | 3 | Crop uptake () | 112 ± 0.20 | 86 ± 0.21 | 56 ± 0.0* | 111 ± 0.27 | 84 ± 0.32 | 55 ± 0.0* | | 4 | Before planting (0–50 cm depth) | 69 ± 3.5 | 86 ± 12.7 | 3 ± 0.18 | 65 ± 2.42 | 78 ± 4.3 | 4 ± 0.3 | | 5 | After harvest (0-50 cm depth) | 159 ± 5.5 | 180 ± 13.9 | 9 ± 0.29 | 156 ± 3.95 | 139 ± 7.3 | 8 ± 0.3 | | 6 | Storage (0–50 cm depth) | 90 ± 2.0 | 94 ± 10.0 | 6 ± 0.37 | 91 ± 2.38 | 61 ± 3.1 | 4 ± 0.4 | | 7 | Output (total loss, uptake, and change; Rows 2 + 3 + 6) | 281 ± 3.8 | 477 ± 9.7 | 76 ± 1.72 | 278 ± 2.12 | 390 ± 8.1 | 71.5 ± 0.5 | | 8 | Mass balance error (Row 1–Row 7) | 11 ± 3.8 | 9 ± 9.7 | 5 ± 1.72 | 8 ± 2.12 | 6 ± 8.1 | 0.5 ± 0.5 |
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