Evaporation or Plant Uptake??

[Ray]

That question still cannot be answered precisely, as there are too many variables, they all change on a daily basis, and some simply cannot be adequately quantified.

• What is the temperature profile?
• Relative humidity?
• Latitude (it affects the sun's angle, hence warming)?
• Season (ditto)?
• Air movement?
• Pot dimensions?
• Type of LECA?
• Size of plant?
• Specific species or hybrid?
• How well established is the plant (i.e., how well developed are its S/H roots and do the extend into the reservoir)?

[orchidjunky]

Originally Posted by Ray

That question still cannot be answered precisely, as there are too many variables, they all change on a daily basis, and some simply cannot be adequately quantified.

• What is the temperature profile?
• Relative humidity?
• Latitude (it affects the sun's angle, hence warming)?
• Season (ditto)?
• Air movement?
• Pot dimensions?
• Type of LECA?
• Size of plant?
• Specific species or hybrid?
• How well established is the plant (i.e., how well developed are its S/H roots and do the extend into the reservoir)?

Sorry for the question but I was just noticing how some of my s/h plants are uptaking more water than others..
I guess there are way too many variables to really know!

[quiltergal]

I have 2 Phals, and 2 Oncs in S/H. Conditions are the same for all with the Phals receiving slightly less light than the Oncs. I have to water the Oncs twice a week as they will drain the reservoir in about 3-4 days. The Phals will still have fluid left in the reservoir after 7 days. HTH!

[orchidjunky]

Originally Posted by quiltergal

I have 2 Phals, and 2 Oncs in S/H. Conditions are the same for all with the Phals receiving slightly less light than the Oncs. I have to water the Oncs twice a week as they will drain the reservoir in about 3-4 days. The Phals will still have fluid left in the reservoir after 7 days. HTH!

My paph and masdie seems to need watering all the time from what I can tell... of course they are in a warmer room than other orchids of mine.. My phals and others seem to uptake rather slowly... but could be cause i just transferred them like 3 weeks ago..