Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
Table 7
Interactive effects of UV-B radiation and nitrogen on Fe concentration (μg g−1) and Fe 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
321.5
51.5 a
49.6
14.8 a
402.0
182.0
28.5
66.4
112.2
19.1 a
C
362.0
70.0 a
60.8
23.8 a
1029.3
300.0
18.3
204.7
184.8
15.6 a
Mean
341.8
60.8
55.2
19.3 B
715.6
241.0
23.4
135.5
148.5
17.4 C
N1
UV
367.0
102.0 a
54.8
35.4 a
363.3
228.0
25.7
70.5
155.1
23.4 a
C
360.7
58.3 b
75.2
31.0 a
445.0
154.3
20.7
108.9
150.5
25.7 a
Mean
363.8
80.2
65.0
33.2 A
404.2
191.2
23.2
89.7
152.8
24.6 B
N2
UV
301.5
59.5 b
50.2
23.2 b
392.5
315.5
29.5
86.3
238.3
29.9 b
C
397.3
101.3 a
95.0
64.4 a
448.7
157.7
29.3
133.8
171.5
43.1 a
Mean
349.4
80.4
72.6
43.8 A
420.6
236.6
29.4
110.1
204.9
36.5 A
N3
UV
375.0
84.7 a
73.1
38.8 a
504.3
281.7
26.0
119.1
231.3
28.9 b
C
289.3
48.0 b
79.7
30.6 a
471.0
194.3
33.0
156.1
230.8
55.1 a
Mean
332.2
66.3
76.4
34.7 A
487.7
238.0
29.5
137.6
231.0
42.0 A
Mean
UV
347.2
78.2
58.3 b
29.9
419.2
252.4
27.1
87.4 b
186.0
25.5 b
C
352.3
69.4
77.7 a
37.4
598.5
201.6
25.3
150.9 a
184.4
34.9 a
ANOVA
Radiation (R)
ns
ns
*
ns
ns
ns
ns
*
ns
**
Nitrogen (N)
ns
ns
ns
+
ns
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, +, *, **, ***.
