Table 5: Interactive effects of UV-B radiation and nitrogen on Ca concentration (mg g−1) and Ca acquired (g m−2) by above-ground organs of maize.

NitrogenRadiationSilkingMaturity
LcScLaSaLcScGcLaSaGa

N0UV7.564.021.101.198.93.040.121.471.920.08 a
C7.803.951.311.318.62.210.111.661.400.10 a
Mean7.68 C3.98 B1.21 B1.25 C8.8 B2.63 B0.121.56 C1.66 C0.09 C

N1UV8.975.471.301.869.82.730.121.941.860.11 a
C10.103.872.102.0511.02.730.112.692.640.13 a
Mean9.53 A4.67 A1.70 A1.95 B10.4 A2.73 B0.112.31 B2.25 B0.12 B

N2UV9.264.201.531.6111.63.780.112.532.860.11 b
C8.643.562.052.2610.62.890.113.133.120.17 a
Mean8.95 AB3.88 B1.79 A1.93 B11.1 A3.34 A0.112.83 A2.99 A0.14 B

N3UV8.844.891.742.2410.43.480.112.433.110.13 b
C7.414.412.042.8110.53.000.133.473.610.23 a
Mean8.13 BC4.65 A1.89 A2.53 A10.5 A3.24 A0.122.95 A3.36 A0.18 A

MeanUV8.714.75 a1.44 b1.79 b10.23.23 a0.122.12 b2.440.11 b
C8.483.95 b1.88 a2.10 a10.22.71 b0.122.74 a2.690.16 a

ANOVA

Radiation (R)ns * ** * ns ** ns *** ns ***
Nitrogen (N)++ ** *** * * ns *** *** ***
R × Nnsnsnsnsnsnsnsnsns+

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 .