Table 4.

Linear regression model of plant growth parameters and chlorophyll, chlorophyll fluorescence parameters

Growth parameters	Linear regression model	AIC	R2	P
Plant height	y = 8.028–7.074 × 1–34.508 × 2 + 0.359 × 3	−30.584	0.882	0.000
Rooting rate	y = − 46.617 + 11.847 × 3 + 38.395 × 4	77.915	0.796	0.001
Average root	y = 5.379 + 0.867 × 3–4.520 × 5	9.754	0.809	0.001
Root length	y = 25.812–36.655 × 1 + 0.687 × 3 + 2.123 × 4	7.718	0.856	0.001
Root surface area	y = 12.271–15.441 × 1 + 0.232 × 3	−13.118	0.787	0.001
Root volume	y = −1.574 + 0.129 × 3 + 1.418 × 4–0.401 × 6	−33.983	0.861	0.001

AIC Akaike information criterion, R² R Square, x₁ Fv/Fm, x₂ Y(II), x₃ ETR_II, x₄ Total chlorophyll content, x₅ Fv/Fo, x₆ Chlorophyll a/b.