Table 3.
Plant P concentration and root/shoot ratio at the final harvest (16 days after treatment) and P influx rate between 7 and 16 days of white lupin, faba bean and maize grown with low (LP) and high P supply (HP) under two N forms [ca(NO3)2 and NH4NO3].
| Parameters | Crops | Ca(NO3)2-N |
NH4NO3-N |
LSD | P level | N form | P × N | ||
|---|---|---|---|---|---|---|---|---|---|
| LP | HP | LP | HP | ||||||
| P concentration | White lupin | 0.35 | 0.76 | 0.36 | 0.94 | 0.07 | *** | * | * |
| (g P 100 g−1 DW) | Faba bean | 0.39 | 1.12 | 0.47 | 1.15 | 0.09 | *** | n.s. | n.s. |
| Maize | 0.10 | 1.27 | 0.12 | 1.26 | 0.05 | *** | n.s. | n.s. | |
| P influx | White lupin | 0.02 | 0.07 | 0.02 | 0.10 | 0.01 | *** | n.s. | * |
| (mg P m−1 root length d−1) | Faba bean | 0.01 | 0.12 | 0.02 | 0.11 | 0.02 | *** | n.s. | n.s. |
| Maize | 0.00 | 0.08 | 0.00 | 0.08 | 0.01 | *** | n.s. | n.s. | |
| root/shoot ratio | White lupin | 16.5 | 15.6 | 15.6 | 18.1 | 1.8 | n.s. | n.s. | n.s. |
| (m root length g−1 shoot DW) | Faba bean | 31.3 | 12.2 | 14.9 | 18.0 | 3.5 | *** | ** | *** |
| Maize | 105.3 | 28.0 | 112.6 | 30.5 | 8.0 | *** | n.s. | n.s. | |
*P ≤0.05;
**P < 0.01;
***P < 0.001; n.s., not significant at P = 0.05.