Quote:
Originally Posted by Orchid Whisperer
Orchid fertilizer does not need to be urea-free. The notion got started back when poorly manufactured urea fertilzer sometimes contained high levels of biuret. Biuret can be harmful at high concentrations. With modern fertilizer production methods, biuret is not a concern.
A scientific study a few years ago proved that orchids use urea quite effectively. That study was performed with Phalaenopsis orchids.
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Thank you for this post - here is the link to the study. I think it is important that people start looking at scientific evidence rather than continue promoting ideas based on hearsay...
Plant and Soil
June 2009, Volume 319, Issue 1-2, pp 95-100
Phalaenopsis can absorb urea directly through their roots
Martin Trépanier, Marie-Pierre Lamy, Blanche Dansereau
Study showing Phalaenopsis can take up urea through their roots!
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