Table 1A.
Parameter values
| Value | Units | |
| Core model parameters | ||
| Crop size | ||
| a | 1·7 | m2 (ground) mol–1 (C) |
| Photosynthesis | ||
| ϵ | 0·03 | mol (C) mol–1 (PAP) |
| σ | 6·0 ×10–3 | m s–1 |
| Nitrogen uptake* | ||
| ϕ | 12 | mol (N) mol–1 (C) |
| K | 0·1 | mol (N) m–3 (H2O) |
| Respiration | ||
| θ | 0·3 | – |
| v | 9·5 | – |
| k | 0·25×10–6 | mol (C) m–2 (ground) s–1 |
| c | = 0·0693† | K–1 |
| T* | = 20 | °C |
| Crop composition | ||
| βC | 0·6 | m3 (H2O) kPa mol–1 (C) |
| βN | 6·0 | m3 (H2O) kPa mol–1 (N) |
| Π | 580 | kPa |
| λ | 0·0009 | m3 (H2O) mol–1 (C) |
| r | 0·16 | mol (N) mol–1 (C) |
| Attenuation | ||
| sp | 10 | – |
| sg | 10 | – |
| bp | 0·97 | – |
| bg | 0·2 | – |
| ξ | 0·4 | – |
| Conversion parameters | ||
| ηC | 0·03 | kg (DM) mol–1 (C) |
| ηN | 0·10 | kg (DM) mol–1 (N) |
| ρ | 1000 | kg (H2O) m–3 (H2O) |
| P | 25 | plant m–2 |
* The parameters ϕ and K were not actually used in the simulations in this paper, since N supply was either abundant or zero.
†c = 0·0693 K–1 is equivalent to the common value Q10 = 2, meaning a doubling of respiration for every 10 K temperature increase.