Independent Variables Regression Equation R2 Coefficient P-Values B2 $\left[\text{CHL-a}\right]=-0.211\ast \text{B}2+10.59$ 0.000 0.993 B3 $\left[\text{CHL-a}\right]=15.55\ast \text{B}3+9.821$ 0.035 0.501 B4 $\left[\text{CHL-a}\right]=3.368\ast \text{B}4+10.38$ 0.001 0.887 B5 $\left[\text{CHL-a}\right]=31.56\ast \text{B}5+9.481$ 0.106 0.2358 $\frac{\text{B}4}{\text{B}3}$ $\left[\text{CHL-a}\right]=2.383\ast \left(\frac{\text{B}4}{\text{B}3}\right)+13.95$ 0.441 0.00685 $\frac{\text{B5}}{\text{B}4}$ $\left[\text{CHL-a}\right]=4.568\ast \left(\frac{\text{B5}}{\text{B}4}\right)+8.231$ 0.275 0.0444 $\frac{\text{B}2+\text{B}4}{\text{B}3}$ $\left[\text{CHL-a}\right]=-3.123\ast \left(\frac{\text{B}2+\text{B}4}{\text{B}3}\right)+16.03$ 0.522 0.00231 $\frac{\text{B}2}{\text{B}4}+\frac{\text{B}4}{\text{B}3}$ $\left[\text{CHL-a}\right]=-3.123\ast \left(\frac{\text{B}2}{\text{B}4}+\frac{\text{B}4}{\text{B}3}\right)+15.89$ 0.529 0.00209 $\frac{\text{B}3-\text{B}2}{\text{B}4}+\frac{\text{B}5}{\text{B}3}+\text{B}2+\text{B}5$ $\left[\text{CHL-a}\right]=9.19\ast \left(\frac{\text{B}3-\text{B}2}{\text{B}4}+\frac{\text{B}5}{\text{B}3}+\text{B}2+\text{B}5\right)+2.814$ 0.693 0.000117 $\frac{\text{B}3-\text{B}2+\text{B}5}{\text{B}4}$ $\left[\text{CHL-a}\right]=3.4\ast \left(\frac{\text{B}3-\text{B}2+\text{B}5}{\text{B}4}\right)+2.37$ 0.703 9.395.10−5 $\frac{\text{B}3-\text{B}2+\text{B}5}{\text{B}4}+\text{B}4$ $\left[\text{CHL-a}\right]=6.43\ast \left(\frac{\text{B}3-\text{B}2+\text{B}5}{\text{B}4}+\text{B}4\right)+3.697$ 0.639 0.000348