Ultraviolet-B Radiation and Nitrogen Affect Nutrient Concentrations and the Amount of Nutrients Acquired by Above-Ground Organs of Maize
Table 1
Above-ground shoot dry biomass of maize (g m−2) at silking and maturity harvest used to calculate element acquired.
Nitrogen
Radiation
Silking
Maturity
Lb
Sb
Lb
Sb
Gb
N0
UV
139.9
287.9 a
161.2 b
563.3
666.9 b
C
166.1
328.6 a
192.8 a
636.9
854.4 a
Mean
153.0 C
308.2 C
177.0 D
600.1 C
760.6 D
N1
UV
147.1
341.9 b
197.9 b
682.7
916.1 b
C
208.3
529.7 a
243.3 a
961.2
1249.9 a
Mean
177.7 BC
435.8 B
220.6 C
821.9 B
1083.0 C
N2
UV
168.8
385.2 b
206.2 b
752.1
1015.9 b
C
237.9
633.4 a
296.4 a
1082.8
1499.2 a
Mean
203.3 B
509.3 A
251.3 B
917.4 B
1257.5 B
N3
UV
197.6
456.5 b
235.6 b
885.3
1125.6 b
C
275.6
636.9 a
332.3 a
1204.5
1682.8 a
Mean
236.6 A
546.7 A
283.9 A
1044.9 A
1404.2 A
Mean
UV
163.3 b
367.9 b
200.2 b
720.8 b
931.1 b
C
222.0 a
532.1 a
266.2 a
971.3 a
1321.5 a
ANOVA
Radiation (R)
***
***
***
***
***
Nitrogen (N)
***
***
***
***
***
R × N
ns
*
*
ns
*
Lb: leaf biomass; Sb: stem biomass; Gb: grain biomass; 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; *, ***.
