Calcium deficiency or something else?

[doams]

this durban poison is showing some rusty spots.
its in coco and ph was around 5.7-5.8 for most of the time..

 

[HazyBulldog]

For sure not Ca. Looks like Mg.

 

[JJ Lowe]

Get it figured out yet?

 

[RubeGoldberg]

couple questions, no point playing the deficiency game without first looking at what's being fed.

too many people like to name deficiencies without looking at what the plant is currently uptaking and how that's happening...


1. What brand of coco are you in?

2. How often do you feed the coco?

3. Do you get runoff from the coco and where does it go?

4. What are you feeding the coco and at what strength.

5. Does the coco dry out?



It could honestly be as easy as letting the coco dry out or getting poor runoff. If you're using an off-the-shelf coco base nutrient, you're most likely just gonna need to adjust your technique a bit.

Often times the leaves may show they're deficient on something like mg, but they're getting fed plenty of it in the root-zone.


if you can answer the questions above, guaranteed we can come up with a gameplan to solve your issues.

 

[doams]

all the symptoms stopped after adjusting the ph to 6.2-6.3 even 6.4 at times.

 

[RubeGoldberg]

all the symptoms stopped after adjusting the ph to 6.2-6.3 even 6.4 at times.

awesome! pH of the rootzone is the answer to most problems.

way too many people play the deficiency game when their chemistry is off.

who cares if the leaves are saying boron or zinc etc.. when the uptake is the issue.



generally in pure coco coir your ideal uptake range is gonna be 5.8-6ish pH, but you also want to feed daily with runoff.. coco's cation exchange capacity is essentially working against the nutrients, so you need to keep the nutes flowing through often enough to overcome that.

 

[doams]

awesome! pH of the rootzone is the answer to most problems.

way too many people play the deficiency game when their chemistry is off.

who cares if the leaves are saying boron or zinc etc.. when the uptake is the issue.



generally in pure coco coir your ideal uptake range is gonna be 5.8-6ish pH, but you also want to feed daily with runoff.. coco's cation exchange capacity is essentially working against the nutrients, so you need to keep the nutes flowing through often enough to overcome that.

these symptoms started in early flower I was feeding in 5.7-5.8 range from start.
gotta go higher @start of flower to prevent it next time I believe this is strain specific a little bit coz these symptoms were not showing on other two plants /trainwreck and g13xbh/
I was using distilled water all thru veg and there was no runoff btw

anyway this is old thread

thx everyone it was already solved and lesson hopefully learned