Treatments

Column 1	Column 2	Column 3	Column 4
No additions	Same as Column 3, but placed in the dark.	10 g Sawdust 5 g CaSO₄ 5 g CaCO₃ 10 mg NH₄Cl 5 mg K₂HPO₄	10 g Chitin 5 g CaSO₄ 5 g CaCO₃ 10 mg NH₄Cl 5 mg K₂HPO₄
Column 5	Column 6	Column 7	Column 8
10 g Glucose 5 g CaSO₄ 5 g CaCO₃ 10 mg NH₄Cl 5 mg K₂HPO₄	10 g Sawdust 6 g FeSO₄ 5 g CaCO₃ 10 mg NH₄Cl 5 mg K₂HPO₄	Same as Column 3, but with only 1/4 the sediments.	Freshwater 5 g CaCO₃ 10 mg NH₄Cl 5 mg K₂HPO₄