Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
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.
Nitrogen
Radiation
Silking
Maturity
Lc
Sc
La
Sa
Lc
Sc
Gc
La
Sa
Ga
N0
UV
51.5
35.0
7.7
10.6
119.5 a
59.5
7.5
19.7 a
37.2
5.0 a
C
53.7
42.7
8.8
13.8
97.0 a
48.7
7.7
18.7 a
31.0
6.5 a
Mean
52.6
38.8 B
8.2
12.2 C
108.2 C
54.1
7.6
19.2 D
34.1 C
5.8 B
N1
UV
95.7
49.7
14.2
17.1
155.7 a
66.7
9.0
31.0 b
44.7
8.2 b
C
73.7
48.0
15.4
25.3
181.0 a
56.3
9.7
44.4 a
54.5
12.0 a
Mean
84.7
48.8 AB
14.8
21.2 B
168.3 B
61.5
9.3
37.7 C
49.6 BC
10.1 A
N2
UV
67.5
56.5
11.1
21.7
168.5 b
65.5
6.5
37.2 b
48.7
6.6 b
C
105.3
63.7
24.4
40.6
265.7 a
52.3
8.7
78.7 a
57.9
12.9 a
Mean
86.4
60.1 A
17.8
31.1 A
217.1 A
58.9
7.6
57.9 B
53.3 AB
9.8 A
N3
UV
104.7
74.7
20.5
34.8
164.3 b
59.7
6.7
38.5 b
53.9
7.5 b
C
77.0
47.7
21.2
30.4
342.0 a
66.7
8.7
113.2 a
80.6
14.6 a
Mean
90.8
61.2 A
20.9
32.5 A
253.2 A
63.2
7.7
75.9 A
67.2 A
11.1 A
Mean
UV
83.9
55.6
14.2
22.0
153.6 b
62.9
7.5 b
32.2 b
46.7
7.1 b
C
77.4
50.5
17.5
27.5
221.4 a
56.0
8.7 a
63.8 a
56.0
11.5 a
ANOVA
Radiation (R)
ns
ns
ns
ns
***
ns
+
***
ns
***
Nitrogen (N)
ns
+
ns
**
***
ns
ns
***
*
**
R × N
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, +, *, **, ***.
