highly significantP value ≤0.001
2 5 {\text{ X}}_{ 2} {\text{X}}_{ 3}\end{aligned} $$\end{document} 6.2 + 4.1 X 1 + 1.87 X 2 - 1.25 X 3 + 3.15 X 1 2 - 1.35 X 2 2 + 0.4 X 3 2 + 3.0 X 1 X 2 - 3.25 X 1 X 3 - 0.25 X 2 X 3 Linear effect of starch was highly significant with P value ≤0.001.