Table 9: Interactive effects of UV-B radiation and nitrogen on Zn concentration (μg g−1) and Zn acquired (mg m−2) by above-ground organs of maize.

NitrogenRadiationSilkingMaturity
LcScLaSaLcScGcLaSaGa

N0UV24.0 a25.5 a3.87.6 a97.0 a66.026.516.0 a39.417.9 a
C31.3 a32.0 a5.210.1 a40.3 b33.322.77.9 b21.119.3 a
Mean27.6 C28.8 B4.5 C8.9 C68.749.7 A24.611.9 C30.318.6 D

N1UV35.3 a47.0 a5.215.7 a67.3 a40.726.313.5 a27.323.9 a
C39.7 a35.0 a8.318.5 a81.7 a24.023.319.8 a23.229.1 a
Mean37.5 B41.0 A6.7 B17.2 B74.532.3 B24.816.6 C25.326.5 C

N2UV39.5 a45.5 a6.517.5 b63.5 b28.024.013.9 b21.124.5 b
C51.3 a47.7 a12.130.2 a100.3 a26.330.729.6 a29.445.4 a
Mean45.4 AB46.6 A9.3 A23.9 A81.927.2 B27.321.7 B25.334.9 B

N3UV58.7 a61.3 a11.328.4 a86.7 a28.326.019.9 b24.829.0 b
C39.7 b34.0 b10.921.7 a105.7 a28.332.335.0 a34.054.1 a
Mean49.2 A47.7 A11.1 A25.0 A96.228.3 B29.227.5 A29.441.5 A

MeanUV40.946.7 a7.0 b18.378.339.5 a25.816.0 b27.824.3 b
C40.537.2 b9.1 a20.282.028.0 b27.323.1 a26.937.0 a

ANOVA

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

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 .