Table 3: Interactive effects of UV-B radiation and nitrogen on P concentration (mg g−1) and P acquired (g m−2) by above-ground organs of maize.

NitrogenRadiationSilkingMaturity
LcScLaSaLcScGcLaSaGa

N0UV3.192.870.480.832.560.99 b3.270.420.622.19 a
C3.232.730.540.882.72 1.87 a3.050.531.182.60 a
Mean3.212.800.51 C0.85 C2.641.43 A3.160.48 C0.902.39 D

N1UV3.492.770.510.952.520.86 b3.200.500.582.92 b
C3.332.820.691.502.801.19 a3.390.681.134.24 a
Mean3.412.800.60 BC1.22 B2.661.02 B3.300.59 BC0.853.58 C

N2UV3.383.050.551.182.271.00 a3.070.500.773.12 b
C3.392.850.801.812.931.22 a3.590.871.315.36 a
Mean3.382.950.68 AB1.49 A2.601.11 B3.330.68 B1.044.24 B

N3UV3.382.900.671.332.520.95 a3.060.590.843.42 b
C3.222.460.891.563.151.02 a3.611.051.226.05 a
Mean3.302.680.78 A1.44 A2.840.99 B3.330.82 A1.034.73 A

MeanUV3.372.880.56 b1.09 b2.48 b0.94 b3.15 b0.51 b0.70 b2.97 b
C3.292.710.73 a1.44 a2.90 a1.33 a3.41 a0.78 a1.21 a4.57 a

ANOVA

Radiation (R)nsns *** *** * ** + *** *** ***
Nitrogen (N)nsns *** *** ns+ns ** ns ***
R × Nnsnsnsnsns+nsnsns ***

Lc: leaf concentration; Sc: stem concentration; La: amount on leaves; Sa: amount on stems; Gc: grain concentration; Ga: amount on grains; UV: high UV-B treatment; C: ambient UV-B treatment; N0, N1, N2, N3: 0, 100, 200, and 300 kg N ha−1.
Means within each N level followed by the same letter (capital letters for N effects within each column) were not significantly different at 𝑃 < 0 . 1 0 . Significance of main effects: ns: not significant; + 𝑃 < 0 . 1 ; * 𝑃 < 0 . 0 5 ; ** 𝑃 < 0 . 0 1 ; *** 𝑃 < 0 . 0 0 1 .