Iron and or magnesium would be my guess
I think what @John q and @Parablennius suggest is probably right. Amazon Frogbit (Limnobium laevigatum) is actually the <"plant I use"> to help and <"diagnose nutrient deficiencies">, via the <"Duckweed Index">.Leaves that are whitish. Is this anything I need to worry about. I couldn't find anything on line to check.
Because the <"chlorosis is in the new leaves"> it is very likely that it is an iron (Fe) deficiency, because iron isn't mobile within the plant and it can't be moved to new leaves........ When in short supply, the plant takes Mg from older leaves, and moves it to newly created ones. And since Mg is a key component of chlorophyll, older leaves get yellow (and are about to be dropped). Lack of sulphur, iron, manganese, zinc leads to chlorosis on newly created leaves........
......Anecdotally we have also have a lot of threads where people (with <"traditional apologies"> to @jameson_uk ) have dosed iron (Fe+++) and still have <"iron deficiency symptoms">, presumably as a result of using a chelator that isn't suitable for <"their water hardness">.........
Iron issues are much more likely if you <"have hard water"> and are usually caused by the iron ions (Fe(++(+))) forming insoluble compounds and precipitating out of solution.tropica aquasoil and use aquadip plant food as well. I didn't realise these wouldn't supply what I needed.
Hi Darrel,Iron issues are much more likely if you <"have hard water"> and are usually caused by the iron ions (Fe(++(+))) forming insoluble compounds and precipitating out of solution.
That is interesting, do you re-mineralise it?The water in the Yorkshire dales here is as soft as a babies bottom
@jameson_uk 's threads have been really useful. I'm sure he won't mind me mentioning that he is red-green colour-blind, which makes the colour element of the "Duckweed Index" a lot more problematic.I've followed up on the links you kindly shared
Cheers, I think given I don't really understand the question the answer is no! It's just what comes out of the tap but when I tested it, it came out as very soft, and we never get an kettle scale etc.That is interesting, do you re-mineralise it?
What does your <"water supplier say">? You may be able to tell <"from this map">?It's just what comes out of the tap but when I tested it,
Sounds like it is soft water. You could try <"Chempak Sequestered Iron">, it contains magnesium (Mg) and manganese (Mn) as well as iron (Fe). Soft water isn't likely to contain much calcium (Ca), manganese or magnesium for <"geological reasons">.nd we never get an kettle scale etc.
You may be able to tell <"from this map">?
I assume the <"Chempak iron"> includes both magnesium (Mg) and manganese (Mn), because they are the three meso / micro-elements that are most associated with leaf yellowing (chlorosis). You would also get <"stunting and lack / loss of greeness"> with deficiencies of nitrogen (N) and / or potassium (K), and they are actually where I'd start in most situations, purely because plants require <"a lot of both of them">.I will give the stuff you suggest a try!
Thanks again - I will try the pack (on order from amazon) along with my regular fertiliser and will report back in a few weeks how its looking!I assume the <"Chempak iron"> includes both magnesium (Mg) and manganese (Mn),
Best of luck, it will take a while unfortunately, whichever deficiency it is. The reason for this is that it is the new leaves that are chlorotic, meaning that the deficient nutrient isn't mobile within the plant and it is only new leaves, produced after that nutrient becomes available, that will be green.will report back in a few weeks how its looking!
We've found that Limnobium laevigatum is a pretty good indicator of nutrient deficiencies, which was why it became my <"preferred Duckweed"> for the <"Duckweed Index">.Is it solely Limnobium suffering this way? I'd like to see some more pics of your plants in the same tank. That could help with diagnosis.
Hi Darrel,Have a look at <"Frogbit taken a turn">, it shows a complete cycle from chlorotic to healthy.