Table 1 Characteristics of cotton N accumulation as varied from different fertilization schedules base on field trial (2012–2013).

From: Minimum fertilization at the appearance of the first flower benefits cotton nutrient utilization of nitrogen, phosphorus and potassium

Trt

Regression equation

P value

Fast accumulation period

t1(DAE)

t2(DAE)

∆t(d)

VT(mg d−1 p−1)

VM(mg d−1 p−1)

Cotton plant

FT1

Y = 215.0232/(1+7.5623e−0.0632t)

0.0053

56.7

80.8

24.1

5.81

6.31

FT2

Y = 188.5340/(1+5.8221e−0.0406t)

0.0198

58.3

84.3

26.0

4.88

5.39

FT3

Y = 162.0064/(1+5.9162e−0.0420t)

0.0033

61.1

98.3

37.1

2.95

3.47

FT4

Y = 155.0550/(1+5.4810e−0.0310t)

0.0061

61.3

100.8

39.5

2.50

3.03

FT5

Y = 151.9169/(1+5.4104e−0.0316t)

0.0001

62.5

108.3

45.8

2.18

2.72

FT6

Y = 206.2834/(1+7.5623e−0.0427t)

0.0101

57.0

82.8

25.8

5.09

5.64

AVE

  

59.5

92.6

33.1

3.90

4.40

Vegetative structure

FT1

Y = 65.6049/(1+6.1838e−0.0534t)

0.0091

46.8

67.9

21.1

1.78

2.28

FT2

Y = 57.5175/(1+4.7956e−0.0460t)

0.0205

47.2

77.8

30.6

1.08

1.59

FT3

Y = 53.4508/(1+3.9414e−0.0327t)

0.0042

49.4

99.1

49.7

0.62

1.14

FT4

Y = 49.9144/(1+3.7049e−0.0304t)

0.0223

50.0

110.2

60.2

0.47

1.00

FT5

Y = 46.2931/(1+4.6205e−0.0300t)

0.0003

49.9

111.0

61.1

0.44

0.94

FT6

Y = 63.1846/(1+5.3409e−0.0605t)

0.0098

44.5

74.6

30.1

1.21

1.73

AVE

  

48.0

90.1

42.1

0.90

1.40

Reproductive structure

FT1

Y = 150.1831/(1+8.7584e−0.0765t)

0.0018

68.0

88.5

20.5

4.96

5.47

FT2

Y = 131.8226/(1+7.8384e−0.0522t)

0.0359

69.6

92.8

23.2

4.05

4.55

FT3

Y = 109.2168/(1+8.8721e−0.0625t)

0.0039

77.0

114.1

37.1

2.13

2.65

FT4

Y = 106.1848/(1+7.9634e−0.0619t)

0.0087

87.6

125.2

37.6

1.87

2.40

FT5

Y = 105.6440/(1+7.5241e−0.0513t)

0.0005

90.5

132.0

41.5

1.76

2.30

FT6

Y = 133.3643/(1+7.2837e−0.0499t)

0.0199

66.0

89.6

23.6

4.00

4.50

AVE

  

76.5

107.0

30.6

3.10

3.60

  1. Where t1 and t2, mean the beginning and termination day of the fast accumulation period (FAP), respectively. T means the duration of FAP, T = t2 − t1. VT and VM mean the average and maximum biomass accumulation speed during the FAP, respectively. Abbreviations: FT1 = 0 DAF (days after the first flower), FT2 = 5 DAF, FT3 = 10 DAF, FT4 = 15 DAF, and FT5 = 20 DAF and at three splits as the conventional control (FT6) for pre-plant fertilization (30% N, and 100% of the other nutrients), first bloom fertilization (40% N), and peak bloom fertilization (30% N).
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