Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
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.
Nitrogen
Radiation
Silking
Maturity
Lc
Sc
La
Sa
Lc
Sc
Gc
La
Sa
Ga
N0
UV
7.56
4.02
1.10
1.19
8.9
3.04
0.12
1.47
1.92
0.08 a
C
7.80
3.95
1.31
1.31
8.6
2.21
0.11
1.66
1.40
0.10 a
Mean
7.68 C
3.98 B
1.21 B
1.25 C
8.8 B
2.63 B
0.12
1.56 C
1.66 C
0.09 C
N1
UV
8.97
5.47
1.30
1.86
9.8
2.73
0.12
1.94
1.86
0.11 a
C
10.10
3.87
2.10
2.05
11.0
2.73
0.11
2.69
2.64
0.13 a
Mean
9.53 A
4.67 A
1.70 A
1.95 B
10.4 A
2.73 B
0.11
2.31 B
2.25 B
0.12 B
N2
UV
9.26
4.20
1.53
1.61
11.6
3.78
0.11
2.53
2.86
0.11 b
C
8.64
3.56
2.05
2.26
10.6
2.89
0.11
3.13
3.12
0.17 a
Mean
8.95 AB
3.88 B
1.79 A
1.93 B
11.1 A
3.34 A
0.11
2.83 A
2.99 A
0.14 B
N3
UV
8.84
4.89
1.74
2.24
10.4
3.48
0.11
2.43
3.11
0.13 b
C
7.41
4.41
2.04
2.81
10.5
3.00
0.13
3.47
3.61
0.23 a
Mean
8.13 BC
4.65 A
1.89 A
2.53 A
10.5 A
3.24 A
0.12
2.95 A
3.36 A
0.18 A
Mean
UV
8.71
4.75 a
1.44 b
1.79 b
10.2
3.23 a
0.12
2.12 b
2.44
0.11 b
C
8.48
3.95 b
1.88 a
2.10 a
10.2
2.71 b
0.12
2.74 a
2.69
0.16 a
ANOVA
Radiation (R)
ns
*
**
*
ns
**
ns
***
ns
***
Nitrogen (N)
+
+
**
***
*
*
ns
***
***
***
R × N
ns
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, +, *, **, ***.
