Table 3 Characteristics of cotton K 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+6.5623e−0.0732t)

0.0053

57.8

83.6

25.8

5.74

6.24

FT2

Y = 188.5340/(1+4.8221e−0.0456t)

0.0198

59.3

87.0

27.7

5.35

5.86

FT3

Y = 180.0064/(1+4.9162e−0.0480t)

0.0033

60.1

95.7

35.6

4.16

4.68

FT4

Y = 166.0550/(1+4.4810e-0.0410t)

0.0061

60.4

98.3

37.9

3.91

4.44

FT5

Y = 163.9169/(1+4.4104e−0.0356t)

0.0001

61.6

102.9

41.3

3.58

4.12

FT6

Y = 211.2834/(1+4.5289e−0.0527t)

0.0101

58.0

85.6

27.6

5.37

5.92

AVE

  

59.5

92.2

32.7

4.69

5.21

Vegetative structure

FT1

Y = 74.6049/(1+5.0838e−0.0634t)

0.0091

47.9

70.7

22.8

1.88

2.38

FT2

Y = 71.5175/(1+3.7956e−0.0560t)

0.0205

48.2

80.5

32.3

1.33

1.84

FT3

Y = 71.4508/(1+2.9414e−0.0367t)

0.0042

48.3

96.5

48.2

0.89

1.41

FT4

Y = 57.9144/(1+2.7049e−0.0324t)

0.0223

49.1

107.7

58.6

0.73

1.26

FT5

Y = 55.2931/(1+2.6205e−0.0200t)

0.0003

49.0

105.6

56.6

0.76

1.26

FT6

Y = 92.1846/(1+4.3409e−0.0615t)

0.0098

45.5

77.4

31.9

1.35

1.87

AVE

  

48.0

89.7

41.7

1.16

1.67

Reproductive structure

FT1

Y = 141.1831/(1+8.3584e−0.0865t)

0.0018

69.1

85.7

16.6

5.78

6.29

FT2

Y = 110.8226/(1+7.0384e−0.0622t)

0.0359

70.6

95.5

24.9

3.88

4.38

FT3

Y = 109.2168/(1+7.8721e−0.0725t)

0.0039

75.9

111.5

35.6

2.71

3.23

FT4

Y = 109.1848/(1+7.2634e−0.0649t)

0.0087

86.7

122.7

36.0

2.67

3.20

FT5

Y = 108.6440/(1+6.5241e−0.0553t)

0.0005

89.6

126.6

37.0

2.60

3.14

FT6

Y = 113.3643/(1+6.0837e−0.0529t)

0.0199

67.0

92.4

25.4

3.79

4.29

AVE

  

76.5

105.7

29.3

3.57

4.09

  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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