Indoor Hello.....me again!

[Vapo]

Hello @Waira .....how's it goin?.....good I hope.....as you know dude, had those dump seeds recently....got over it, done!.....now, lol, I have 2 Forgotten Strawberries going and one is showing rust spots on the leaves.....I have had this before on the first single finger leaves, I just thought it was splashback from feeding maybe?......anyway it usually goes away buuuut this time it isn't, and the other one is completely unaffected, breached the same time, same nutes, pot, breeder(Meph), light.....everything!!...you can see the tips of the unaffected one in the pics, thanks in advance..........

 

[Waira]

:smoking: Vapo mate, I don't remember your grow specifics, review them for me? Have you seen the patient form in the sticky section above here?
....coco if I recall rightly? Sure looks like Ca defc. to me, and oddly early.... If it's coco, is it ready to use bag stuff, or a brick? the latter needs proper rinsing and final CEC buffering usually, otherwise the damn coco hogs the shit outta the Ca, locking it up to itself....
......light distances, type; all that plays roles, so does the occasional bitchy pheno',....

 

[Tom Bombadil]

was dropping by to say calcium, but Waira beat me to it

 

[Vapo]

Problem: rust spots on leaves

Medium/grow method: Ecothrive coco/perlite mix....precharged with beetle frass, I believe....I feed DTW

Feed: and supplements used: Shogun cal-mag.....rest is Buddhas Tree full line

water source:....tapwater bubbled for 24hrs beforehand

Strain/age:....Forgotten Strawberries....and she is 18 days old

light used:....2 x Skyline400(mk2).....distance is about 21"

Climate:. ..temp is 22°C and Rh is between 50% and 60%

Additional info:......the rust spots seem to be appearing on leaf veins, in the middle of the different little leaf sections......damn its hard to explain by typing lol...
Many apologies @Waira for not doing the form first bro lol.....that damn "Oops.." message has me typing like a madman all over the site haha ....glad Hobbes is/has sorting/sorted it.

 

[Vapo]

was dropping by to say calcium, but Waira beat me to it

Thank you @Ron Paul much appreciated dude

 

[Tom Bombadil]

im no professional, but i personally would probably run some r/o water through it, then feed normal strength nutes but bump up cal if u arent already running higher cal to compensate for the coco..if you have the cal maxed out already then its probably ph related..
i would also switch to r/o and not tap water in order to rule out unknowns..
but Waira probably knows more about coco than I...so

 

[Proph]

Are you feeding nutrients every time you water? What is the ppm of the feed you are using?

 

[Waira]

thanks Vapo, that helps!
... it is irritating as hell to have one same strain plant do fine, the other not so much,... two things right off the bat there to consider: pheno' differences, inherent in all seeds, and each pot becomes it's own little ecosystem/"world"....

... Missing info Vapo: with coco, always we will need the base water pH and ppm; then what the ppm is after adding the Ca-Mg (always that goes first, before other nutes)... then the final ppm/EC and pH before going in... And just as important, how much run-off are you putting through, and it's ppm and pH...
Not all toxicities or nute ion overloads can be readily apparent, especially if borderline... but too much of something like, say, Mg, can mess with the uptake of other cations, notably Ca... it's a competitive sort of thing sometimes; with Ca and Mg, toxicity symptoms and levels are harder to define and notice vs. something like K, or N, which show glaring symptoms.... So this is why I need the data that matta' on your inputs and outputs!
Your water, if hard, is a mitigating factor on many things... coco pH needs to be lower than true soils, about 6.0; hard water is full of CaCO3, which has a pH buffering affect, plus it loads up the coco with CaCO3 that may not be dissolved into the Ca++ (plants wants this) and the CO3--/HCO3- which is what's involved with buffering pH... Then you add in the fully available Ca-Mg, and shit gets tangled real fast as you see- .... to eliminate this set of variables, many chose to run RO/Di/very low ppm water....
>> all this is angling to finding out why this one plant is showing Ca defc.,... One things that's a real bitch, is there's no pH nute availability chart for coco! I can only assume it's something in between the two charts for true soil and hydro... Look in the Defc. Pic Depot, page 2....
Ca is pretty pH stable in soil, but it's rather borderline in hydro, at a very touchy "saddle point".... with coco and the wonky CEC it has, it's more complicated yet!
Pending this other info, one thing to try that takes all the roots/coco out of the equation is foliar sprays with the Ca-Mg... I'd be happier if that Shogun wasn't a 3 in the N content, but likely not an issue... You will need a wetting agent (castile soap will do in a pinch), just enough to stop the solution from beading up,... this allows it to coat and stick better... Spray underside of leaves especially, more stomata there vs topside....

 

[Vapo]

there's no pH nute availability chart for coco! I

Dude I found this.....any good to you?....

 

[Waira]

:smoking: got it already, and not my preferred chart,....