Table 2.
Mathematical description of N flows from uptake and mobilization in different organs. k1, k2and k3, slope of equations characterizing 15N allocation, endogenous N allocation and mobilization in the different organs, respectively (×10−3 °Cd−1); N1, highest N content derived from N uptake (mg per plant); N2, highest N content derived from mobilization in each organ (mg per plant)
| N derived from uptake |
N derived from mobilization |
|||||||
|---|---|---|---|---|---|---|---|---|
|
k1 |
N1 |
k2 |
N2 |
K3 |
||||
| Pods | 12·45 (3) | 259·3 | 7·53 (4) | 694·69 | – | |||
| Flowers | 19·31 (3) | 62·3 | 10·13 (4) | 93·99 | 3·82 (5) | |||
| Stem | 9·12 (3) | 375·09 | 22·35 (4) | 72·35 | 15·56 (5) | |||
| Taproot | 7·70 (3) | 87·66 | – | – | 0·89 (5) | |||
| Node 36 | 18·37 (3) | 0·53 | 10·33 (4) | 0·91 | 16·44 (5) | |||
| Node 35 | 19·14 (3) | 0·806 | 25·09 (4) | 1·11 | 16·59 (5) | |||
| Node 34 | 12·25 (3) | 1·29 | 23·22 (4) | 1·57 | 16·65 (5) | |||
| Node 33 | 12·41 (3) | 2·09 | 24·17 (4) | 1·98 | 10·56 (5) | |||
| Node 32 | 13·09 (3) | 4·34 | 24·17 (4) | 3·50 | 18·02 (5) | |||
| Node 31 | 13·48 (3) | 6·25 | 25·14 (4) | 4·63 | 9·75 (5) | |||
| Node 30 | 13·97 (3) | 9·3 | 24·07 (4) | 2·17 | 16·47 (5) | |||
| Node 29 | 14·32 (3) | 13·05 | 25·91 (4) | 8·08 | 11·57 (5) | |||
| Node 28 | 14·50 (3) | 16·26 | 26·01 (4) | 13·12 | 12·41 (5) | |||
| Node 27 | 14·96 (3) | 21·06 | 27·34 (4) | 14·14 | 7·19 (5) | |||
| Node 26 | 15·17 (3) | 21·42 | 27·15 (4) | 12·26 | 10·81 (5) | |||
| Node 25 | 15·07 (3) | 21·82 | 27·36 (4) | 9·31 | 12·43 (5) | |||
| Node 24 | 15·80 (3) | 22·49 | 28·66 (4) | 8·46 | 13·04 (5) | |||
| Node 23 | 15·70 (3) | 18·84 | 26·05 (4) | 1·87 | 15·39 (5) | |||
| Node 22 | 16·44 (3) | 25·11 | 29·62 (4) | 2·68 | 8·7 (5) | |||
| Node 21 | 17·46 (3) | 26·8 | 29·81 (4) | 2·32 | 21·16 (5) | |||
| Node 20 | 17·44 (3) | 26·48 | – | – | 21·32 (5) | |||
| Node 19 | 22·08 (3) | 22·81 | – | – | 23·04 (5) | |||
| Node 18 | 26·83 (3) | 26·36 | – | – | 22·66 (5) | |||
| Node 17 | 16·62 (3) | 21·51 | – | – | 22·79 (5) | |||
| Node 16 | 23·08 (3) | 21·43 | – | – | 22·99 (5) | |||
| Node 15 | 22·20 (3) | 21·32 | – | – | 23·02 (5) | |||
| Node 14 | 34·85 (3) | 13·35 | – | – | 21·58 (5) | |||
| Node 13 | 23·32 (3) | 12·74 | – | – | 23·78 (5) | |||
| Node 12 | 26·76 (3) | 13·68 | – | – | 28·09 (5) | |||
| Node 11 | 17·42 (3) | 3·03 | – | – | 26·90 (5) | |||
Numbers in brackets correspond to the following equations: (3) dN/dt = k1N (1 − N/N1); (4) dN/dt = k2N (1 − N/N2); (5) dN/dt = k3N[1 − N/(N2 + Cumulative net N export)].