Source of variation | RLD 5 × 5 cm to seed (8 cm radius) (cm cm−3) | Rhizosphere pH 5 × 5 cm to seed (8 cm radius) | δ15 N (o/oo)15N/14N | N conc. (% DM) | N content (mg N plant−1) | P conc. (mg P g−1 DM) | P content (mg P plant−1) | Shoot DM (g plant−1) |
---|---|---|---|---|---|---|---|---|
LS means N*BE | ||||||||
14NO3 −-mixed*NoBE | 6.4 | 5.62 | 170 | 1.83 | 114.0 | 2.18 | 13.7 | 6.35 |
14NO3 −-mixed*Pro | 6.2 | 5.89 | 148 | 2.22 | 130.1 | 2.32 | 13.6 | 5.91 |
15NH4 +-depot*NoBE | 10.5 | 4.41 | 25,260 | 2.47 | 137.1 | 2.93 | 16.2 | 5.60 |
15NH4 +-depot*Pro | 9.9 | 4.55 | 21,257 | 2.66 | 133.9 | 3.15 | 15.9 | 5.09 |
Standard error | 0.68 | 0.13 | 831 | 0.13 | 4.69 | 0.146 | 0.62 | 0.420 |
Two-Way ANOVA | ||||||||
N | < 0.001*** | < 0.001*** | < 0.001*** | 0.002 ** | 0.014* | < 0.001*** | 0.002** | NS |
14NO3 − | 6.3 | 5.75 | 159 | 2.03 b | 122.0 b | 2.52 b | 13.6 b | 6.13 |
15NH4 + | 10.2 | 4.48 | 23,259 | 2.57 a | 135.5 a | 3.04 a | 16.0 a | 5.35 |
BE | NS | NS | 0.036 | 0.051 | NS | NS | NS | NS |
NoBE | 8.4 | 5.01 | 12,715 | 2.15 | 125.7 | 2.56 | 15.0 | 5.97 |
Pro | 8.0 | 5.22 | 10,702 | 2.44 | 132.0 | 2.73 | 14.7 | 5.50 |
N*BE | NS | NS | NS | NS | NS | NS | NS |