Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
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.
Nitrogen
Radiation
Silking
Maturity
Lc
Sc
La
Sa
Lc
Sc
Gc
La
Sa
Ga
N0
UV
24.0 a
25.5 a
3.8
7.6 a
97.0 a
66.0
26.5
16.0 a
39.4
17.9 a
C
31.3 a
32.0 a
5.2
10.1 a
40.3 b
33.3
22.7
7.9 b
21.1
19.3 a
Mean
27.6 C
28.8 B
4.5 C
8.9 C
68.7
49.7 A
24.6
11.9 C
30.3
18.6 D
N1
UV
35.3 a
47.0 a
5.2
15.7 a
67.3 a
40.7
26.3
13.5 a
27.3
23.9 a
C
39.7 a
35.0 a
8.3
18.5 a
81.7 a
24.0
23.3
19.8 a
23.2
29.1 a
Mean
37.5 B
41.0 A
6.7 B
17.2 B
74.5
32.3 B
24.8
16.6 C
25.3
26.5 C
N2
UV
39.5 a
45.5 a
6.5
17.5 b
63.5 b
28.0
24.0
13.9 b
21.1
24.5 b
C
51.3 a
47.7 a
12.1
30.2 a
100.3 a
26.3
30.7
29.6 a
29.4
45.4 a
Mean
45.4 AB
46.6 A
9.3 A
23.9 A
81.9
27.2 B
27.3
21.7 B
25.3
34.9 B
N3
UV
58.7 a
61.3 a
11.3
28.4 a
86.7 a
28.3
26.0
19.9 b
24.8
29.0 b
C
39.7 b
34.0 b
10.9
21.7 a
105.7 a
28.3
32.3
35.0 a
34.0
54.1 a
Mean
49.2 A
47.7 A
11.1 A
25.0 A
96.2
28.3 B
29.2
27.5 A
29.4
41.5 A
Mean
UV
40.9
46.7 a
7.0 b
18.3
78.3
39.5 a
25.8
16.0 b
27.8
24.3 b
C
40.5
37.2 b
9.1 a
20.2
82.0
28.0 b
27.3
23.1 a
26.9
37.0 a
ANOVA
Radiation (R)
ns
+
*
ns
ns
+
ns
**
ns
***
Nitrogen (N)
*
*
***
***
ns
+
ns
***
ns
***
R × N
+
*
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, +, *, **, ***.
