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Table 4 Effect of daily hours worked on average hourly productivity for mechanised harvesters operating in eucalypt plantations

From: Effect of work schedule design on productivity of mechanised harvesting operations in Chile

Category

Sub-category

Hours worked per day

Average ** Productivity (m3 hr-1)

Standard error productivity (m3 hr-1)

Change in productivity relative to 9-hour work day (%)

Season

Winter

9

24.5 a

0.8

0

  

12

22.9 b

0.1

−7

  

16

20.3 c

0.1

−17

  

18

20.1 c

0.1

−18

 

Summer

9

22.3 a

0.8

0

  

12

19.4 b

0.1

−13

  

16

18.2 c

0.2

−19

  

18

17.3 d

0.1

−23

Forest Class*

A

9

25.0 a

1.8

0

  

12

25.0 a

0.3

0

  

16

20.0 b

0.5

−20

  

18

18.0 c

0.5

−28

 

B

9

24.0 a

0.7

0

  

12

24.0 a

0.1

0

  

16

21.3 b

0.1

−11

  

18

19.3 c

0.1

−19

 

C

9

22.3 a

0.9

0

  

12

17.4 b

0.1

−22

  

16

16.4 c

0.2

−26

  

18

16.4 c

0.3

−26

Species

E. globulus

9

23.0 a

1.8

0

  

12

16.3 b

0.1

−29

  

16

15.5 b

0.4

−33

  

18

15.5 b

0.8

−33

 

E. nitens

9

23.4 a

0.6

0

  

12

22.7 a

0.1

−3

  

16

19.8 b

0.1

−16

  

18

18.6 c

0.1

−21

  1. * Forest class refers to the average tree size in the stand: A = > 0.75 m3, B = 0.5 to 0.74 m3, C = < 0.5 m3. No Forest Class A stands of E. globulus are included in this summary.
  2. ** Shift lengths within each sub-category with letter codes that differ from letter codes of other shift lengths are significantly different at the p = 0.05 level.