Table 10: Interactive effects of UV-B radiation and nitrogen on Mn concentration (μg g−1) and Mn acquired (mg m−2) by above-ground organs of maize.

NitrogenRadiationSilkingMaturity
LcScLaSaLcScGcLaSaGa

N0UV51.535.07.710.6119.5 a59.57.519.7 a37.25.0 a
C53.742.78.813.897.0 a48.77.718.7 a31.06.5 a
Mean52.638.8 B8.212.2 C108.2 C54.17.619.2 D34.1 C5.8 B

N1UV95.749.714.217.1155.7 a66.79.031.0 b44.78.2 b
C73.748.015.425.3181.0 a56.39.744.4 a54.512.0 a
Mean84.748.8 AB14.821.2 B168.3 B61.59.337.7 C49.6 BC10.1 A

N2UV67.556.511.121.7168.5 b65.56.537.2 b48.76.6 b
C105.363.724.440.6265.7 a52.38.778.7 a57.912.9 a
Mean86.460.1 A17.831.1 A217.1 A58.97.657.9 B53.3 AB9.8 A

N3UV104.774.720.534.8164.3 b59.76.738.5 b53.97.5 b
C77.047.721.230.4342.0 a66.78.7113.2 a80.614.6 a
Mean90.861.2 A20.932.5 A253.2 A63.27.775.9 A67.2 A11.1 A

MeanUV83.955.614.222.0153.6 b62.97.5 b32.2 b46.77.1 b
C77.450.517.527.5221.4 a56.08.7 a63.8 a56.011.5 a

ANOVA

Radiation (R)nsnsnsns *** ns+ *** ns ***
Nitrogen (N)ns+ns ** *** nsns *** * **
R × Nnsnsnsns ** 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 .