Bending leaves

[GeorgeCloney]

@Waira
I can't remember if it's Magnesium or Phosphorus def'c that causes leaf twisting at the edges?

 

[Waira]

:smoking: Generally, it's Mg defc. but in older leaves and much more advanced cases... this seedling isn't Mg defc.; leaf distortions can happen for a myriad of reasons and are common, usually temporary....
If you are in coco, matters are more complex with Ca/Mg, and coco's bitchy CEC properties with these two cations in particular... As long as you are feeding right away, weakly, with proper nutes you'll be off to a good start... coco specific nutes need no extra Ca-Mg, BTW, it's in there already,... Coco is devoid of nutes, save a bit of K...
As a caution to all new coco growers, Ca-Mg use must be judicious or you'll start getting antagonistic uptake issues with other nutes, including Ca and Mg screwing with each others uptake! Coco itself is a major hog of these two, and poorly Ca/Mg buffered (not pH here) CEC in coco is a fucking nightmare to deal with, so be quite sure of the coco's quaility, and if it's brick or bagged RTU... brick's often need at least some sort of "rinse", using a weak Ca-Mg solution to clear out any lingering native Na and excess K, and help set that CEC buffering... Both Ca and Mg are 2+ charged cations, they bind very strongly to the coco particles, so that's why the coco must have a saturation of them in order for the normal give & take thing to work properly concerning ion exchange....
One last thing: there is no such thing as "Ca-Mg" defc., it's one or the other,.... Ca is immobile (withing the plant), Mg isn't, and their defc. symptoms are totally different...

 

[GeorgeCloney]

I

:smoking: Generally, it's Mg defc. but in older leaves and much more advanced cases... this seedling isn't Mg defc.; leaf distortions can happen for a myriad of reasons and are common, usually temporary....
If you are in coco, matters are more complex with Ca/Mg, and coco's bitchy CEC properties with these two cations in particular... As long as you are feeding right away, weakly, with proper nutes you'll be off to a good start... coco specific nutes need no extra Ca-Mg, BTW, it's in there already,... Coco is devoid of nutes, save a bit of K...
As a caution to all new coco growers, Ca-Mg use must be judicious or you'll start getting antagonistic uptake issues with other nutes, including Ca and Mg screwing with each others uptake! Coco itself is a major hog of these two, and poorly Ca/Mg buffered (not pH here) CEC in coco is a fucking nightmare to deal with, so be quite sure of the coco's quaility, and if it's brick or bagged RTU... brick's often need at least some sort of "rinse", using a weak Ca-Mg solution to clear out any lingering native Na and excess K, and help set that CEC buffering... Both Ca and Mg are2+ charged cations, they bind very strongly to the coco particles, so that's why the coco much have a saturation of them in order for the normal give & take thing to work properly concerning ion exchange....
One last thing: there is no such thing as "Ca-Mg" defc., it's one or the other,.... Ca is immobile (withing the plant), Mg isn't, and their defc. symptoms are totally different...

I'M growing in Canna Coco.
The coco was properly rinsed prior to potting.
My last grow was double buffered in GH calmag as per the advice of another cocoforcanabis site that was not good advice, well not completely anyways.
My test seedlings suffered from Magnesium def'c exactly as you called it So I prefer dealing with a def'c to add than to remove( which is impossible).
I'm following GN's recommendation of starting Mega Crop at about 4 grams per gallon with a little Sweet Candy.
@Dabber and @pop22 are running mc at
400-525 ppm.
GN's recommendation at 4gr/gallon is really high. Pop22 comments on most people feeding way too much.
I think there is a lot of truth to that.
As a final note to others reading this post.
I wish to thank @Waira @pop22 and @Dabber for the help and advice you guys offer regularly without expecting any kind of reward or compensation.
I believe recognition is at times a decent form of reward.
And on that I want to say thank you.
THIS is why some of us are more than pleased to fund this sites exisitance.

 

[Dabber]

I

I'M growing in Canna Coco.
The coco was properly rinsed prior to potting.
My last grow was double buffered in GH calmag as per the advice of another cocoforcanabis site that was not good advice, well not completely anyways.
My test seedlings suffered from Magnesium def'c exactly as you called it So I prefer dealing with a def'c to add than to remove( which is impossible).
I'm following GN's recommendation of starting Mega Crop at about 4 grams per gallon with a little Sweet Candy.
@Dabber and @pop22 are running mc at
400-525 ppm.
GN's recommendation at 4gr/gallon is really high. Pop22 comments on most people feeding way too much.
I think there is a lot of truth to that.
As a final note to others reading this post.
I wish to thank @Waira @pop22 and @Dabber for the help and advice you guys offer regularly without expecting any kind of reward or compensation.
I believe recognition is at times a decent form of reward.
And on that I want to say thank you.
THIS is why some of us are more than pleased to fund this sites exisitance.

for the kind words I'm always more than happy to help anyone when I can

 

[Waira]

good to hear mate, some of what I said was geared more toward other readers! Coco is hands down the #1 problem medium I see in Sick Bay, mostly because it's not being used like it was meant to be. Many treat it no differently than true soil, and that almost always ends up going sideways at some point
.... pop' and Dab's are the go-to's for MC, but I'm not sure they run coco? At least currently, so those ppm's may be with soil in mind, not coco... In coco by-hand feeding, it's about frequent mild dosing (vs. less frequent, stronger in soil) which coco is basically made for. It breaths and drains so well vs. soil/peat based soilless that the usual consequences of such saturation are far less likely to happen; plus, each time you do that whole 15-20+% run-off each time, you're purging out the "picked over" nutes in there, replacing it with fresh balanced soln., and when it does that and drains, it's drawing in fresh air/O2...
Are you testing the pH and ppm going in, and coming out? This is how you keep the salt build-up in check, and monitor the estimated in-pot pH...
One thing difficult about MC, and any so called "all-in-one" nutrient, is seeing what all those ppm's are of, specifically... Since MC is a total shot-gum blast of all basic nutes and many other supplements (like Si, humic-fulvic, aminos', etc.) the relative ppm values can be deceiving,... how much is Ca/Mg alone? Si, and other ionic components? Not sure about amino charges, maybe like sugars they have none since they are not undergoing actual ionic separation like salts do... Sugar dissolves, in that they individual sugar molecules break from of the crystal, but each molecule remains intact unlike a salt that form +/- charges ions... What the more or less neutral dissolves solids do to conductivity, I'm not totally sure but they do influence readings!
Point is, say 450ppm of MC may not be so rich in the primary, secondary and especially micronutes as the reading would seem,... As always, best you can do is measure carefully and see what the plants say,... they have the loudest call in all this, and it's a variable one, strain to strain, even pheno's!

Cheers GC, just paying it forward! I got great help and support from the Olde Guard here when I came here, a rare thing in the troll infested Outlands-