Table 2 Characteristics of cotton P 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)

Total plant

FT1

Y = 58.0232/(1+7.5623e−0.0632t)

0.0053

61.0

88.7

27.7

1.22

1.44

FT2

Y = 48.5340/(1+5.8221e−0.0406t)

0.0198

62.6

92.2

29.7

0.95

1.17

FT3

Y = 44.0064/(1+5.9162e−0.0420t)

0.0033

63.3

99.8

36.5

0.70

0.92

FT4

Y = 42.0550/(1+5.4810e−0.0310t)

0.0061

63.6

101.4

37.8

0.65

0.87

FT5

Y = 39.9169/(1+5.4104e−0.0316t)

0.0001

64.8

106.0

41.2

0.56

0.79

FT6

Y = 55.2834/(1+7.5623e−0.0427t)

0.0101

61.2

91.0

29.7

1.07

1.30

AVE

  

62.7

96.5

33.7

0.90

1.10

Vegetative structure

FT1

Y = 19.6049/(1+6.1838e−0.0534t)

0.0091

51.1

75.8

24.7

0.47

0.69

FT2

Y = 16.5175/(1+4.7956e−0.0460t)

0.0205

51.4

85.5

34.0

0.30

0.52

FT3

Y = 16.4508/(1+3.9414e−0.0327t)

0.0042

51.5

91.4

39.9

0.23

0.46

FT4

Y = 15.9144/(1+3.7049e−0.0304t)

0.0223

52.3

99.7

47.4

0.20

0.42

FT5

Y = 15.2931/(1+4.6205e−0.0300t)

0.0003

52.2

100.5

48.3

0.18

0.41

FT6

Y = 18.1846/(1+5.3409e−0.0605t)

0.0098

48.7

82.5

33.8

0.31

0.53

AVE

  

51.2

89.2

38.0

0.30

0.50

Reproductive structure

FT1

Y = 39.1831/(1+8.7584e−0.0765t)

0.0018

72.3

93.8

21.6

1.05

1.27

FT2

Y = 32.8226/(1+7.8384e−0.0522t)

0.0359

73.9

100.6

26.7

0.72

0.94

FT3

Y = 28.2168/(1+8.8721e−0.0625t)

0.0039

79.1

116.6

37.5

0.43

0.66

FT4

Y = 27.1848/(1+7.9634e−0.0619t)

0.0087

89.9

127.8

37.9

0.41

0.64

FT5

Y = 24.6440/(1+7.5241e−0.0513t)

0.0005

92.8

131.7

38.9

0.37

0.60

FT6

Y = 37.3643/(1+7.2837e−0.0499t)

0.0199

72.2

95.5

25.3

0.85

1.07

AVE

  

80.0

111.0

31.3

0.60

0.90

  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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