| Nutrient Level | |||
| Sampling time and nutrient | Deficient | Intermediate | Sufficient |
| Early season (pre-bulbing) |
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| Total N, % | 4 | 4-5 | 5 |
| PO4-P, ppm | 2000 | 2000-3000 | 3000 |
| Soluble K, % | 3 | 3-4 | 4 |
| Midseason (bulbing) |
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| Total N, % | 3 | 3-4 | 4 |
| PO4-P, ppm | 2000 | 2000-3000 | 3000 |
| Soluble K, % | 2 | 2-3 | 3 |
| Late season (post-bulbing) |
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| Total N, % | 2 | 2-3 | 3 |
| PO4-P, ppm | 2000 | 2000-3000 | 3000 |
| Soluble K, % | 1 | 1-2 | 2 |
Plant Part to sample is the newest fully elongated leaf blade.
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Division of Agriculture and Natural Resources, University of California. All contents copyright © 2020 The Regents of the University of California. All Rights Reserved. Development funding from the University of California and USDA, CSREES. Please e-mail your comments to: vric@ucdavis.edu Last updated: August 21, 2020 |
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