data: Once you’ve decided how to fill your column, carefully
observe what you put inside. In a notebook, describe the color,
texture, smell and shape of everything you put in the bottle. Weigh
everything before it goes into the column.
Schedule column checks for at least once a week to record changes.
Note changes in the column contents' height, color, shape, texture
and odor. Hold a ruler next to the column to record changes in the
height of the contents. Insert a thermometer from the top of the
column to determine temperature changes. Can you figure out the
rate of change? You can also test the pH of the leachate (the solution
that drips through the column) or use it in a bioassay
for more on pH.
anything moving?: Look for the appearance of any "critters,"
such as flies, beetles, slugs, millipedes, or snails. Decomposition
Columns offer good opportunities for observation and description.
Try using photographs or drawings to record changes. Write a story
about what is going on in your column. What do you predict will
happen during decomposition?