Table 1 Factor coding of quadratic orthogonal rotation combination design

From: Selection of culture conditions for callus induction and proliferation by somatic embryogenesis of Pinus koraiensis

Level X1/NAA X2/6-BA X3/KT
1.682 2 0.5 0.5
1 1.5945 0.3986 0.3986
0 1 0.25 0.25
− 1 0.4055 0.1014 0.1014
− 1.682 0 0 0
Δj 0.5945 0.1486 0.1486
  1. The first column is the level coding of experimental factors; the last three are concentration values of NAA, 6-BA and KT under each level. Charling quadratic general rotation design parameter table obtains an asterisk arm of 1.682