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Table II
Mean values (± SE) of morphological parameters of red pine seedlings after the second growing season. Seedlings were fall fertilized with a single application of ammonium nitrate (NH4 NO3) at rates of 0, 11, 22, 44 and 89 kg N ha−1. For each parameter, values in the same row with different letters differed statistically according to Fisher’s Least Significant Difference test at α = 0.05.
Fall fertilizer application rate (kg N ha−1) | |||||
---|---|---|---|---|---|
0 | 11 | 22 | 44 | 89 | |
Height (cm) | 13.02 (0.73)a | 14.23 (0.68)a | 14.87 (0.80)a | 15.49 (0.55)a | 16.28 (0.68)a |
RCD (mm) | 3.43 (0.17)c | 3.63 (0.18)bc | 4.17 (0.19)abc | 4.27 (0.22)ab | 4.88 (0.22)a |
Shoot dry mass (g) | 4.20 (0.46)b | 4.84 (0.53)b | 6.19 (0.69)ab | 6.08 (0.76)ab | 8.18 (0.76)a |
Root dry mass (g) | 0.98 (0.09)b | 1.13 (0.08)b | 1.49 (0.16)ab | 1.42 (0.11)ab | 1.91 (0.21)a |
Shoot N conc. (%) | 1.31 (0.10)a | 1.37 (0.06)a | 1.32 (0.03)a | 1.35 (0.09)a | 1.25 (0.04)a |
Root N conc. (%) | 0.75 (0.06)a | 0.71 (0.02)a | 0.71 (0.03)a | 0.73 (0.04)a | 0.68 (0.04)a |
Shoot N cont. (mg) | 51.57 (7.37)b | 69.50 (10.54)ab | 77.96 (11.22)ab | 84.83 (13.02)ab | 103.40 (10.06)a |
Root N cont. (mg) | 6.64 (0.68)b | 8.50 (0.86)b | 9.69 (1.70)ab | 10.64 (1.04)ab | 13.56 (2.09)a |
Number of needle primordia | 100.8 (8.3)cd | 82.7 (3.7)d | 109.7 (3.6)bc | 126.2 (7.5)b | 172.5 (5.2)a |