Research Article
Nitrate-Nitrogen Leaching from Onion Bed under Furrow and Drip Irrigation Systems
Table 6
Mean and standard errors for NO3-N, chloride, and water balance during two onion growing seasons (2006–09) in furrow-irrigated onion field in NM.
| | | Furrow-irrigated field (2006-07) | Furrow-irrigated field (2008-09) | | | 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 | 295 | 522 | 95 | 295 | 530 | 100 | | 2 | Deep percolated (>50 cm depth) | 150 ± 2.2 | 331 ± 2.7 | 19 ± 0.85 | 145 ± 0.5 | 306 ± 3.07 | 22.3 ± 1.0 | | 3 | Crop uptake (*) | 104 ± 0.21 | 78 ± 0.20 |
*61 ± 0.0 | 106 ± 0.1 | 79 ± 0.52 |
*62 ± 0.0 | | 4 | Before planting (0–50 cm depth) | 94 ± 1.7 | 105 ± 4.7 | 3 ± 0.24 | 83.7 ± 1.9 | 87.2 ± 1.9 | 3 ± 0.15 | | 5 | After harvest (0–50 cm depth) | 134 ± 2.9 | 208 ± 4.7 | 10 ± 0.53 | 129.3 ± 1.2 | 224.2 ± 1.9 | 11 ± 0.29 | | 6 | Storage (0–50 cm depth) | 40 ± 1.2 | 102 ± 8.2 | 7 ± 0.35 | 45.6 ± 2.6 | 137 ± 0.31 | 8 ± 0.43 | | 7 | Output (total loss, uptake, and change; Rows 2 + 3 + 6) | 294 ± 1.8 | 512 ± 6.9 | 87 ± 1.2 | 297 ± 3.1 | 522 ± 2.6 | 95 ± 0.62 | | 8 | Mass balance error (Row 1–Row 7) | 1 ± 1.8 | 10 ± 6.9 | 8 ± 1.2 | −2 ± 3.1 | 8 ± 2.6 | 8 ± 0.62 |
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