Table 5 Results of orthogonal array testing and extreme variance analysis of the longitudinal fertilization uniformity coefficient.

From: Optimized design and experiment of a controllable rotary tube strip fertilizer spreader for hilly mountainous terrain

Code

A

B/°

C/mm

Y2/%

1

1

35

75

63.98

2

1

50

100

27.3

3

1

65

125

53.69

4

2

35

100

36.12

5

2

50

125

32.37

6

2

65

75

52.3

7

3

35

125

30.31

8

3

50

75

20.53

9

3

65

100

12.58

\(\overline{{K_{1} }}\)

144.97

130.41

136.81

 

\(\overline{{K_{2} }}\)

120.79

80.20

76.00

 

\(\overline{{K_{3} }}\)

63.42

118.57

116.37

 

\(\overline{{k_{1} }}\)

48.32

43.47

45.60

 

\(\overline{{k_{2} }}\)

40.26

26.73

25.33

 

\(\overline{{k_{3} }}\)

21.14

39.52

38.79

 

R

27.18

16.74

20.27

 

Priority order

A > C > B

High level

A3

A3

A3

A3

Preferred option

A3B2C2