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Table 4 Eigenvalues of cotton plant biomass accumulation in the field were affected by different N rates in 2015 and 2016

From: Cotton N rate could be reduced further under the planting model of late sowing and high-density in the Yangtze River valley

Treatment

2015

2016

t1

DAE / d

t2

DAE / d

Δt

/ d

VT

/ (g·m−2·d−1)

VM

/ (g·m−2·d−1)

t1

DAE / d

t2

DAE / d

Δt

/ d

VT

/ (g·m−2·d−1)

VM

/ (g·m− 2·d− 1)

Cotton plant biomass

 N120

68.8

111.0

42.2

10.75

12.25

71.2

114.0

42.9

13.21

15.07

 N150

61.0

104.9

43.9

10.66

12.15

84.1

129.9

45.8

12.94

14.76

 N180

71.3

99.5

28.3

19.90

22.69

85.7

130.2

44.5

15.39

17.55

 N210

73.6

106.7

33.1

16.88

19.24

88.4

149.5

61.1

11.69

13.33

 N240

81.6

113.9

32.3

18.35

20.92

76.9

127.7

50.8

13.88

15.84

 Average

71.3

107.2

35.9

15.31

17.45

81.3

130.3

49.0

13.42

15.31

Vegetative organ biomass (VOB)

 N120

59.0

78.3

19.3

7.78

8.86

60.4

109.1

48.7

5.17

5.89

 N150

55.1

76.2

21.1

8.31

9.47

68.6

127.6

59.0

4.45

5.07

 N180

59.2

84.2

25.0

8.48

9.67

67.2

118.0

50.8

5.91

6.74

 N210

55.3

88.0

32.8

5.90

6.73

68.8

125.3

56.5

5.87

6.69

 N240

58.9

87.4

28.5

6.57

7.24

58.7

105.3

46.5

7.07

8.07

 Average

57.5

82.8

25.3

7.41

8.39

64.7

117.1

52.3

5.69

6.49

Reproductive organ biomass (ROB)

 N120

84.5

109.4

24.9

10.22

11.65

93.8

118.3

24.5

9.56

10.91

 N150

82.6

106.2

23.6

10.10

11.51

92.3

115.4

23.1

10.28

11.72

 N180

80.9

103.2

22.3

12.89

14.69

95.0

115.0

20.0

13.90

15.86

 N210

84.5

108.1

23.5

12.43

14.17

91.9

109.7

17.9

13.66

15.58

 N240

81.6

103.6

22.0

11.56

13.18

94.1

111.2

17.1

13.87

15.82

 Average

82.8

106.1

23.3

11.44

13.04

93.4

113.9

20.5

12.26

13.98

Reproductive relative organ biomass (R. ROB)

 N120

67.2

106.0

38.8

1.26

1.43

80.0

114.5

34.5

2.33

2.65

 N150

63.6

108.0

44.5

1.21

1.38

82.4

119.1

36.7

2.55

2.91

 N180

68.0

116.4

48.4

1.29

1.48

83.7

123.7

40.0

2.68

3.05

 N210

60.6

105.8

45.2

1.61

1.83

87.8

139.9

52.1

2.32

2.64

 N240

65.3

117.4

52.1

1.80

2.05

89.0

140.9

51.9

2.38

2.71

 Average

64.9

110.7

45.8

1.43

1.63

84.6

127.6

43.0

2.45

2.80

  1. DAE indicates days after emergence (d). t1 and t2 are the beginning and terminating days of the fast accumulation period (FAP), respectively. Δt indicates the duration of FAP, Δt = t2 - t1. VT and VM are the average and maximum accumulation speed during FAP, respectively.