Raybo got me thinking about the size of the wicking chamber orifice in addition to the size of the wicking chamber itself, and how they effect the amount of water wicked to the soil chamber. I'd like to get a better handle on how to manage the moisture level of the potting medium in these contraptions without so much blind trial and error. I've read that inexpensive moisture meters are pretty inaccurate, so I go to thinking about alternative ways to measure moisture--how about weight?
The experiment would take 4 identical SWCs (I'm making some smaller 3.5 gallon buckets that work well for this):
- Bucket 'A' would use a 2 inch pipe for wicking chamber with a 2" orifice.
- Bucket 'B' would have a 2 inch pipe and a 1 inch orifice.
- Bucket 'C' would have a 1 inch pipe and a 1 inch orifice.
- Bucket 'D' would have a 2 inch pipe and a .5 inch orifice.
The potting medium for all containers would be wetted in bulk, and a measured amount of water and weight of wetted potting mix added each container. Each container would be weighed to make certain they all have same total weight. The tops would be covered and the fill tube opening covered so the only opening would be the overflow hole. All 4 buckets would sit in the same room with a fairly constant room temp for 10 days to allow plenty of time for the systems to equalize. At the end, the water would be carefully pumped out of the reservoirs using a pump siphon and each bucket weighed. In theory, the best performer (the dryest potting medium) should weigh the least. If nothing else it should give a good indication if orifice size or wicking chamber volume is more important.
If the experiment works, it could be a great way to test out different potting mediums as well. Of course there are plenty of other variables like ambient temperature, warming from the sun, plant water usage at early vs. later stages, but at least this could give us a baseline for some of the other variables,
I'm open to any and all suggestions and feedback.
rnewste
engineeredgarden
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