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  #11  
Old 06-25-2022, 02:32 PM
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tmoney tmoney is offline
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nah, half of that was just to give you a hard time, ray. i don't think enough people on ob do that!!

but the main variable i was considering which i was hoping you would address was shape of the media particles. also, there are different types of packing peanuts, and while we have common access to some, i think others may not. ok, grodan is probly pretty consistent from place to place. but certainly particle shape and size will affect water retention. which is why i suggested an individual particle trial. also, the compaction which you mentioned, as well as i was thinking in your description you had a basically flat layer of foam at the bottom which seemd to me would certainly cause more water to build up due to slower drainage.

the angle of which you drain water from the container was brought up in this thread by somebody else, and that is something which would need to be controlled at the least. it stood out to me because i have always done that with all of my houseplants (and now do with orchids), and it always amazes me how much extra water comes out just by tipping the pot slightly.

plus, i have spent the past two weeks scrutinizing student independent investigation reports for flaws in the scientific method, so i was still in work mode when i read your post. aaaannnd, i really really really hate tv science for presenting limited evidence but stating a matter of fact conclusion as if the matter is closed.
it never is in science...amiright?? anyways, just throwing stuff out there that i was thinking of when reading your results report.

Last edited by tmoney; 06-25-2022 at 02:34 PM..
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  #12  
Old 06-25-2022, 08:18 PM
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Certainly particle size, shape, particle size distribution and materials affect the water holding properties. I was focusing on interstitial water and chose a convenient material that saturated easily.

Had I selected new, dry LECA, of uniform size and tried the same experiment, the amount of bridging water would have been zero, because they absorb relatively slowly. Over time, however, as the pellets became saturated, the same bridging water scenario would come into effect. To a different degree- sure - it the same concept applies

We used to refer to these as “proof of concept” tests that can be followed up with more closely controlled experiments to nail it down better.

I sleep well enough with this minimal knowledge.

Also… if you have sufficient time to tip your pots, you obviously have too few plants!!!
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