Table 5. Summary of studies examining the influence of organic fertilization on plant δ15N values.
| Fertilizer | Fertilizer δ15N (‰, AIR) | Plant | Plant δ15N (‰, AIR) | Δ15Nfertilized–control | Reference |
| Pig manure | 13.9 | Maize | 7.7 | +1.1 | [102] |
| Various composts | 17.4±1.2 | Maize | 17.7 | +13.5 | [196] |
| Various composts | 17.4±1.2 | Nightshade | 13.4 | +10.7 | [196] |
| Various composts | 17.4±1.2 | Pepper | 14.5 | +9.8 | [196] |
| Various composts | 17.4±1.2 | Mustard | 16.3 | +12.7 | [196] |
| Various composts | 17.4±1.2 | Melon | 13.3 | +10.1 | [196] |
| Various composts | 17.4±1.2 | Lettuce | 13.5 | +9.4 | [196] |
| Various composts | 17.4±1.2 | Spinach | 9.5 | +3.9 | [196] |
| Various composts | 17.4±1.2 | Beefsteak plant | 19.9 | +15.4 | [196] |
| Various composts | 17.4±1.2 | Sesame | 17.8 | +12.1 | [196] |
| Pig manure | 16.9 | Chrysanthemum | 10.3 | +3.5 | [194] |
| Pig manure | 16.9 | Cabbage | 13.3 | +5.6 | [194] |
| Sheep manure | – | Sweet pepper | 10.0 | – | [198] |
| Chicken manure | – | Sweet pepper | 10.2 | – | [198] |
| Horse manure | – | Sweet pepper | 9.8 | – | [198] |
| Livestock manure | 8.7±0.2 | Orange (pulp) | 9.0 | – | [132] |
| Poultry manure | 8.6±0.3 | Orange (pulp) | 8.5 | – | [132] |
| Livestock manure | 8.7±0.2 | Orange (juice) | 8.5 | – | [132] |
| Poultry manure | 8.6±0.3 | Orange (juice) | 7.9 | – | [132] |
| Pig manure | 16.4 | Chinese cabbage | 12.5 | +11.0 | [195] |
| Mixed (Cattle+poultry manure) | 16.7 | Tomato | 13.5 | +10.2 | [199] |
| Mixed (Cattle+poultry manure) | 9.9 | Tomato | 7.9 | +4.6 | [199] |