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I need help. Few of my paphis do this: new roots stop at cca. 2-3 cm , become brown and slimy....Any idea?
root problem
- Thread starter dodidoki
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Xavier listed something similar as being boron/zinc deficiency related. Maybe could be that? I have never done his recommended ammonium nitrate boric acid calcium nitrate tank mix but maybe worth a try. Mancozeb does work great for me to green up plants for zinc/manganese
I think Tony might do a similar boron/calcium drench. Not sure if he can recommend ratios. I think it was on the pdf that’s online that Xavier wrote
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Yes, Xavier said the same....but i had another problem related with this. After i gave boron , at adviced cc, symptoms did not disappear, it is ok after a short period, but leaves softened a bit....as intracellular tourgor preassure decreased ....
Interesting. Is it one subgroup of paphs only or several different kinds? Have you tried spraying with mancozeb/dithane?
Beyond that I don’t really have the knowledge. It’s maybe not directly related but I use kelpak monthly and get good roots that extend as long as I keep them moist. Maybe if you get some of that it could overpower this issue?
Using natural fertilizer like kelp or fish emulsion would be my best bet for an unknown deficiency
Beyond that I don’t really have the knowledge. It’s maybe not directly related but I use kelpak monthly and get good roots that extend as long as I keep them moist. Maybe if you get some of that it could overpower this issue?
Using natural fertilizer like kelp or fish emulsion would be my best bet for an unknown deficiency
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Deficiency is an interesting and difficult question.....if you give an element in high cc, can cause def. of another element.....eg. boron def. causes similar symptoms as ca def., however they are competitive antagonist parts for plants...if you give too much ca, can cause boron def. and vice versa....
What is "cca"?
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So what is too much....
Approximately...(circulated=cca....by latyn)
I think we put too much on the shoulders of "nutrient deficiencies". Sure, a plant may look pale if undernourished, but slower-than-normal growth is far more common than other observable defects.
People seem to think that plants react quickly, but they generally don't, and what they have absorbed "today" might be sufficient for a long time.
I know an award-winning grower who feeds calcium nitrate on a routine basis, an N-P-K (only) product quarterly, and a soluble trace element mix once a year.
People seem to think that plants react quickly, but they generally don't, and what they have absorbed "today" might be sufficient for a long time.
I know an award-winning grower who feeds calcium nitrate on a routine basis, an N-P-K (only) product quarterly, and a soluble trace element mix once a year.
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Thank you Ray, I didn t say that it is because of nutritient def ... I only look for other guys who had similar problems and could solve it .
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Oh, and how ...
how high chelated zinc(/micros) were supplied?
Zn is particular essential to meristem & def. may also contribute to small new leaf(def. auxin) & it's more or less mobile from old leaf to new growth
while Mn tend to accumulate as leaf mature
--- somewhat higher than common one but not particular high compared with MSU/K-lite
The early roottip dismiss is regularly seen & I don't get a clear answer on it. Better to ask someone who get good roots even without the help of kelp which dose hormone to the root zone
&when were the medium last repotted?
sometimes I think the medium need to be changed in a regular matter because of exhaustion of sth....as I cannot really see the physical breakdown/detect the acidification of medium
Zn is particular essential to meristem & def. may also contribute to small new leaf(def. auxin) & it's more or less mobile from old leaf to new growth
while Mn tend to accumulate as leaf mature
written in the 2012 guideline, with my quick calculation the recipe goes to : Zn:0.227mg/L Mn:0.975mg/L Cu:0.255mg/L B:0.262mg/L Mo:0.093mg/L
--- somewhat higher than common one but not particular high compared with MSU/K-lite
The early roottip dismiss is regularly seen & I don't get a clear answer on it. Better to ask someone who get good roots even without the help of kelp which dose hormone to the root zone
&when were the medium last repotted?
sometimes I think the medium need to be changed in a regular matter because of exhaustion of sth....as I cannot really see the physical breakdown/detect the acidification of medium
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Are you using bio stimulants?
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The problem itself.
brown part progress faster than the white root tip and root tip eventually give some mucus secretion, and then collapse. Short root sym. in paph always progress like this. Someone may tell you to cover the emerging roottip with moist mix......
Are the roots below the surface healthy? If so
I would put sphagnum moss on the substrate surface deep enough to cover the new roots. The new roots would like a moist shady environment to survive long enough to turn down.
I would put sphagnum moss on the substrate surface deep enough to cover the new roots. The new roots would like a moist shady environment to survive long enough to turn down.
TBH, I "suspect" the problem is from chelated iron coupled with root light exposure
Some OA like malate can aggregate Fe3+ & indeed photoactive...
Some root meristem abortion with NH4+ again comes with Fe deposit, excessive ros gen. ,callose deposit at plasmodesmata and phloem flux restriction which possibly relieve through external sugar...
Again not able to proof anything...but I think there is normally no such thing as high conc. soluble Fe3+ occurs in well aerated neutral pH soil , root secrete sth to solublize Fe from solid medium....&once enough they stop and never bother with1%or0.1%Fe content in soil
Sometimes Fe can raise fenton reaction withH2O2 which is inevitable in roottip
Some OA like malate can aggregate Fe3+ & indeed photoactive...
Some root meristem abortion with NH4+ again comes with Fe deposit, excessive ros gen. ,callose deposit at plasmodesmata and phloem flux restriction which possibly relieve through external sugar...
Again not able to proof anything...but I think there is normally no such thing as high conc. soluble Fe3+ occurs in well aerated neutral pH soil , root secrete sth to solublize Fe from solid medium....&once enough they stop and never bother with1%or0.1%Fe content in soil
