Table 2.
F-values in two-way ANOVA analysis of root morphological traits in 31 wheat cultivar seedlings under different N-sources and pH levels.
| Source | df | Maximum seminal root length | Nodal root number | Maximum nodal root length | Total root length | Total root surface area | Total root volume | Root average diameter | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Squares sum (×102) | F-value | Squares sum (×102) | F-value | Squares sum | F-value | Squares sum (×104) | F-value | Squares sum (×103) | F-value | Squares sum | F-value | Squares sum (×103) | F-value | ||
| Cultivar | 30 | 42.2 (37.1) | 12.8** | 71.9 (59.4) | 20.5** | 258 (32.5) | 10** | 22.9 (28.8) | 17.4** | 38.6 (42.4) | 12.4** | 5.86 (47.0) | 19.2** | 0.113 (15.4) | 4.9** |
| pH | 1 | 17.1 (15.1) | 156** | 30.0 (24.9) | 2574** | 100 (12.6) | 116** | 10.2 (12.8) | 233** | 15.3 (16.8) | 148** | 1.55 (12.5) | 153** | 0.542 (74.0) | 719** |
| N-forms | 1 | 43.8 (38.5) | 399** | 0.18 (0.2) | 1.5 ns | 354 (44.6) | 412** | 42.2 (52.8) | 963** | 27.1 (29.7) | 262** | 4.10 (32.9) | 403** | 0.009 (1.2) | 11.3** |
| pH × N-forms | 1 | 0.67 (0.6) | 6.1* | 8.3 (6.9) | 71.6** | 4.3 (0.6) | 5.1* | 0.56 (0.7) | 12.8** | 0.73 (0.8) | 7.1** | 0.05 (0.4) | 4.5* | 0 (0) | 0.05 ns |
| Error | 90 | 9.8 (8.7) | 10.5 (8.7) | 77 (9.7) | 3.9 (4.9) | 9.3 (10.2) | 0.91 (7.3) | 0.68 (9.3) | |||||||
N-forms refers to the three nitrogen-forms effect; pH refers to the three pH levels effect; N-forms × pH refers to nitrogen-form × pH levels interaction effects. Values in brackets following the sum of squares for variables indicate the percentage (%) of given variation to total variation. * and ** indicate significant at 0.05 and 0.01 level, respectively. df refers to the degree of freedom. ns means to no significant difference.