Table 3 Effect of nitrogen application rate on nitrogen accumulation in spring maize (kg·hm−2).

From: Construction of a critical nitrogen dilution curve for maize in Southwest China

Cultivar

Nitrogen

Jointing stage

Bell-mouth stage

Silking stage

Filling stage

Maturity stage

2014

2015

2014

2015

2014

2015

2014

2015

2014

2015

ZH 311

N 0

4.51d

2.27e

8.10 e

10.02f.

19.02 d

14.07 g

24.30e

19.89 g

32.79d

21.96 g

N150

23.60 b

26.20 c

47.06c

31.96d

72.32 c

66.60e

90.36c

86.51e

108.92b

100.00e

N 300

27.75a

32.10 a

70.54a

56.45a

116.86 a

100.64a

119.74a

119.17a

140.27a

133.01a

N 450

–

27.18b

–

46.68b

–

92.76b

–

114.76b

–

127.34b

Av

18.62A

21.93A

41.90 A

36.28 A

69.40 A

68.52 A

78.13 A

85.08 A

93.99 A

95.58 A

XY 508

N 0

4.16d

2.66e

5.89f.

7.00 g

11.78 e

7.90 h

15.36f.

13.11 h

21.00e

15.15 h

N 150

20.60 c

22.79d

43.91d

24.66e

67.27 c

55.04f.

81.94d

70.33f.

86.96c

75.68f.

N 300

23.35b

27.36b

51.16b

41.33c

92.06 b

79.87d

98.07b

96.48d

112.05b

106.65d

N 450

–

25.98c

–

45.71b

–

88.17c

–

104.42c

–

118.60c

Av

16.04 B

19.70B

33.65 B

29.68 B

57.04 B

57.75 B

65.12 B

71.09 B

73.34 B

79.02 B

F value

Cultivar (C)

153.89**

417.81**

302.12**

473.21*

84.43**

739.70**

150.09**

276.71**

508.66**

276.85**

Nitrogen (N)

3,981.19**

12,871.84**

4,553.85**

3,796.08**

1,484.18**

8,935.41**

2,530.53**

2,669.12**

4,159.34**

2,375.17**

C × N

32.53**

108.68**

137.86**

106.44**

21.58**

84.86**

16.64**

17.19**

27.33**

26.29**

  1. Different lowercase and uppercase letters denote significant differences at 0.05 and 0.01 levels, respectively; * and ** indicate significant difference or correlation at 0.05 and 0.01 levels, respectively.
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