condition mean min max 12pM Fe,Midday 18.4931 18.4931 18.4931 12pM Fe,Midnight 17.41265 12.756 22.0693 58pM Fe,Midday 16.1965 16.1965 16.1965 58pM Fe,Midnight 10.799922857142857 0.0 14.964 233pM Fe,Midnight 4.123993333333333 3.22606 4.70078 1160pM Fe,Midday 4.070908571428571 2.26443 5.57654 1160pM Fe,Midnight 4.017131666666667 1.95648 5.74118 High carbon,Dark 8.411889066666667 0.363793 25.4767 High carbon,Light 3.3643112307692307 0.0 7.89608 Low carbon,Dark 18.7049 18.7049 18.7049 Phloroglucinol 0.6430806666666666 0.385694 0.827731 Silicon starvation,12h 0.0 0.0 0.0