Table 1 Characterizing experimental factors and corresponding coded levels in CCD.

From: Critical assessment of furrow openers and operational parameters for optimum performance under conservation tillage

Factors

Units

Level of independent variables

− α (− 1)

Lowest (− 1)

Middle (0)

Highest (+ 1)

 + α (+ 1)

A: Furrow openers

Num

SD

SD

ITRC

DD

DD

B: Forward speed

km/h

1.5

1.5

2

2.5

2.5

C: Straw density

t/ha

1

1

2

3

3

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