Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
Table 8
Interactive effects of UV-B radiation and nitrogen on Cu concentration (μg g−1) and Cu acquired (mg m−2) by above-ground organs of maize.
Nitrogen
Radiation
Silking
Maturity
Lc
Sc
La
Sa
Lc
Sc
Gc
La
Sa
Ga
N0
UV
11.50
2.00
1.79
0.57
17.5 a
6.00
2.00
2.88 a
3.78
1.34
C
9.67
3.00
1.59
0.98
11.7 b
6.00
1.33
2.26 a
3.58
1.14
Mean
10.59
2.50 B
1.69
0.78 B
14.6 B
6.00
1.67
2.57 C
3.68 B
1.24 B
N1
UV
14.00
3.33
2.06
1.12
14.3 b
3.67
1.67
2.84 b
2.58
1.55
C
14.33
3.00
2.99
1.60
19.0 a
5.33
1.33
4.63 a
5.19
1.66
Mean
14.17
3.16 B
2.52
1.36 B
16.7 B
4.50
1.50
3.73 B
3.89 B
1.60 B
N2
UV
12.00
3.50
2.00
1.37
18.5 b
5.00
1.50
4.05 b
3.77
1.52
C
11.00
3.67
2.55
2.32
24.3 a
5.00
1.33
7.20 a
5.32
1.95
Mean
11.50
3.59 AB
2.27
1.85 AB
21.4 A
5.00
1.42
5.63 A
4.54 AB
1.73 B
N3
UV
14.33
7.00
2.94
3.25
22.0 a
5.33
2.33
5.10 b
4.79
2.67
C
10.67
4.00
2.92
2.54
22.7 a
5.67
1.67
7.53 a
6.84
2.78
Mean
12.50
5.50 A
2.93
2.90 A
22.3 A
5.50
2.00
6.32 A
5.81 A
2.72 A
Mean
UV
13.20
4.20
2.26
1.70
18.1
4.90
1.90 a
3.77 b
3.72 b
1.84
C
11.42
3.42
2.51
1.86
19.4
5.50
1.42 b
5.41 a
5.23 a
1.88
ANOVA
Radiation (R)
ns
ns
ns
ns
ns
ns
+
***
*
ns
Nitrogen (N)
ns
+
ns
*
**
ns
ns
***
+
*
R × N
ns
ns
ns
ns
*
ns
ns
**
ns
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 . Significance of main effects: ns: not significant, +, *, **, ***.
