| N | nitrogen |
| C | carbon |
| NUE | N use efficiency |
| NNI | N nutrition index |
| NRE | N recovery efficiency |
| Nf | N fertilizer |
| NCE | N conversion efficiency |
| HI | harvest index |
| NHI | N harvest index |
| %Nc | critical plant N concentration |
| Nc | critical N uptake |
| Wc | maximum biomass without N limitation |
| WUE | water use efficiency |
| RUE | radiation use efficiency |
| T | transpiration |
| G × E × M | genotype × environment × management |
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