As the result of a discussion on a thread entitled "Submerged Crypts," the topic of allelopathy was broached. To quote
1/ Over the course of my crypt growing years, I have observed the results of the allelotoxins that some crypts distribute. I don't know if this is a common occurrence or not, but I do not seem to be able to grow crypts and vals anywhere near each other. The vals simply start to 'fade away' even though they were taking over the tank BC (before crypts) Whether that is a result of direct competition for nutrients or the result of allelopathy, I'm not sure but my plants are well fertilized with a mixture of cow manure, sheep manure, red clay, topsoil and iron filings, so I would suspect allelopathy.
From time to time I have also noticed that some crypts don't like close proximity with other crypt species. I can't really remember which species now because at the time I just thought that I had put a species somewhere it didn't like, so I moved it. It wasn't 'til many years later that I realized what was going on.
Perhaps this is fodder for a new crypt thread. "Allelopathy Amongst Crypt Species." Perhaps this could save us all time and plants if we shared our experiences.
2/ I would be interested to hear examples in detail.
I usually have my crypts growing very closely and haven't experienced any obvious signs of allelopathy yet. If I noted any "problems" at all, these seemed to come down to competition for light or nutrients IMHO.
3/ Yes i would love to see some examples also! because I usually grow crypts compact and tight to each other. thanx for your experience!
4/ Hi there Kai. I apologize for my lack of memory regarding the inter-species allelopapathy. Over the years I have changed my growing strategy so I do not see this anymore. Now I grow my crypts in separate containers with only a layer of sand over them as a topdressing so that the edges of the containers don't show. I started doing this 'just in case' when I started growing Crypt. cordata grabowskii with other crypts instead of growing them on their own. These were simply to scarce to take any chances of losing them.
5/ Sounds like a good idea. Start a thread on allelopathy in crypts, and I will make it a stickey. Let's have experiments with pictures, such as two crypts grown together versus each grown separately. To reduce effects of crowding, try to have the same plant biomass in each tank something like this:
Well, here's the new thread. As I mentioned previously, "I do not seem to be able to grow crypts and vals anywhere near each other. The vals simply start to 'fade away' even though they were taking over the tank BC (before crypts) Whether that is a result of direct competition for nutrients or the result of allelopathy, I'm not sure but my plants are well fertilized with a mixture of cow manure, sheep manure, red clay, topsoil and iron filings, so I would suspect allelopathy.
I would be most interested to hear from other members with similar experiences of allelopathy, either with other genera or with cryptocorynes. Please add your experience to the discussion.
To start, has there been anyone else with similar experiences with the prolixity of Vallisneria
Everyone will benefit from your experiences with either positive or negative.
Thanks for the encouragement HeyPK eh