Table 2.
Means for traits of potato cultivars grown in the different phosphorus fertilization regimes HP (KH2PO4), OP (C6H16CaO24P6), and LP (without P supply).
| Trait/cultivar | HP | OP | LP | Mean | ||||
|---|---|---|---|---|---|---|---|---|
| Plant dry matter (g plant−1) | ||||||||
| Amsel | 11.3 | 11.7 | 12.6 | 11.9 | AB | |||
| Gesa | 9.8 | 13.5 | 10.8 | 11.4 | AB | |||
| Paterson’s Victoria | 13.8 | 12.0 | 12.0 | 12.6 | B | |||
| Weinberger Schloßkipfler | 9.7 | 10.9 | 8.63 | 9.8 | A | |||
| Mean | 11.2 | ns | 12.0 | 11.0 | ||||
| Root/shoot ratio (g g−1) | ||||||||
| Amsel | 0.51 | 0.50 | 0.46 | 0.49 | ns | |||
| Gesa | 0.51 | 0.42 | 0.48 | 0.47 | ||||
| Paterson’s Victoria | 0.41 | 0.44 | 0.48 | 0.44 | ||||
| Weinberger Schloßkipfler | 0.54 | 0.55 | 0.57 | 0.55 | ||||
| Mean | 0.49 | ns | 0.48 | 0.50 | ||||
| Plant P content (mg plant−1) | ||||||||
| Amsel | 41.5 | 32.4 | 32.4 | 35.4 | ns | |||
| Gesa | 34.8 | ab | 45.4 | b | 29.1 | a | 36.4 | |
| Paterson’s Victoria | 49.6 | b | 31.6 | a | 34.4 | a | 38.5 | |
| Weinberger Schloßkipfler | 37.7 | 35.5 | 27.3 | 33.5 | ||||
| Mean | 40.9 | b | 36.2 | b | 30.8 | a | ||
| Plant P concentration (mg g−1) | ||||||||
| Amsel | 3.70 | 2.91 | 2.56 | 3.11 | ns | |||
| Gesa | 3.70 | 3.32 | 2.75 | 3.21 | ||||
| Paterson’s Victoria | 3.62 | 2.63 | 2.98 | 3.16 | ||||
| Weinberger Schloßkipfler | 4.19 | 3.41 | 3.27 | 3.56 | ||||
| Mean | 3.80 | b | 3.15 | a | 2.93 | a | ||
| P utilization efficiency (g mg−1) | ||||||||
| Amsel | 0.27 | 0.36 | 0.40 | 0.34 | ns | |||
| Gesa | 0.28 | 0.31 | 0.37 | 0.32 | ||||
| Paterson’s Victoria | 0.28 | 0.38 | 0.35 | 0.33 | ||||
| Weinberger Schloßkipfler | 0.25 | 0.31 | 0.32 | 0.29 | ||||
| Mean | 0.27 | a | 0.34 | b | 0.36 | b | ||
| Rhizosphere acid phosphatase activity (µg pNP g−1 h−1) | ||||||||
| Amsel | 21.6 | 18.4 | 15.8 | 18.6 | B | |||
| Gesa | 14.9 | 18.6 | 18.3 | 17.3 | B | |||
| Paterson’s Victoria | 13.5 | 6.08 | 15.0 | 11.5 | AB | |||
| Weinberger Schloßkipfler | 13.7 | 12.1 | 17.7 | 14.5 | B | |||
| Without plant | 5.2 | 6.3 | 7.5 | 6.4 | A | |||
| Accession mean | 15.9 | ns | 13.8 | 16.7 | ||||
| Total root length (cm) | ||||||||
| Amsel | 3577 | 3068 | 2663 | 3103 | AB | |||
| Gesa | 2701 | 3213 | 3401 | 3105 | AB | |||
| Paterson’s Victoria | 3975 | 3926 | 3356 | 3752 | B | |||
| Weinberger Schloßkipfler | 2814 | 3048 | 2493 | 2785 | A | |||
| Mean | 3267 | ns | 3314 | 2978 | ||||
| Specific root length (cm cm−3) | ||||||||
| Amsel | 1612 | a | 1680 | a | 1837 | b | 1710 | B |
| Gesa | 1689 | 1554 | 1584 | 1609 | AB | |||
| Paterson’s Victoria | 1627 | ab | 1559 | a | 1736 | b | 1641 | AB |
| Weinberger Schloßkipfler | 1480 | a | 1527 | a | 1707 | b | 1571 | A |
| Mean | 1602 | a | 1580 | a | 1716 | b | ||
Different uppercase letters indicate statistical significance between cultivar overall means, different lowercase letters indicate statistical significance between treatments according to Tukey’s HSD (p < 0.05). If G × T interaction was significant according to ANOVA (p < 0.05), means separation was carried out between treatments for each cultivar separately. ns: not significant.
Cultivar and treatment overall means are displayed in italics.