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List of sampling information of root and leaf of I.indigotica.
| index | Nitrogen level | Nitrogen amount kg/hm2 | Organ |
|---|---|---|---|
| LN-z | severe nitrogen deficiency | 0 | Leaf |
| LN-h | medium-nitrogen deficiency | 337.5 | |
| LN-n | Normal-nitrogen (CK) | 675 | |
| RN-z | severe nitrogen deficiency | 0 | Root |
| RN-h | medium-nitrogen deficiency | 337.5 | |
| RN-n | Normal-nitrogen (CK) | 675 |
