Major issues, please help!

[SweetSkunk]

I'll keep this as brief as I can.

I've been, for the first time correcting my pH.
My soil is too acidic, around 5.3-5.8.

I pHed my feed to approx 7.5 to try an titrate the soil to its correct level. I did this for a couple of feeds.

A couple of days after the last feed, I noticed so issues:



The stems of the leaves become extreamley weak at the base and fall off. The whole leaf yellows a bit too. It seems to be the bigger fan leaves and the lower half of the plant

Is this a pH issues?

I have RO water and use Tangs auto feed schedule (sensi advanced nutrients)
I do have, but don't give the sensi cal/mag as the sensi A and B feed says it doesn't require the cal mag. Is it a cal-mag issue?

Cheers!

EDIT:

I did, after noticing the issue, pick the leaves off and feed with the 6.5pH feed. However more leaves on all the plant have done the same thing. So I'm unsure if it pH or not.

 

[SweetSkunk]

 

[MedGrower]

There is this AFN Infirmary Patient Form. If you would fill it out and post it here along with pictures of the whole plant under natural light, you would ensure you get the kind of help you want.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

 

[SweetSkunk]

Problem:

I've been, for the first time correcting my pH.
My soil is too acidic, around 5.3-5.8.

I pHed my feed to approx 7.5 to try an titrate the soil to its correct level. I did this for a couple of feeds.

A couple of days after the last feed, I noticed some issues
The stems of the leaves become extreamley weak at the base and fall off. The whole leaf yellows a bit too. It seems to be the bigger fan leaves and the lower half of the plant


-Medium/grow method: Light mix, Bio Green and bio Buzz, both soil types suffering the same issues

Feed and supplements used:

Sensi advanced nutrient line. A and B up to day 40, increasibg in small increments, following Tangs easy feeding schedule. II Hav used these nutes before with no issue. I do not use the cal mag at the moment although I have it.

-Water source: RO water. No EC test.

-Strain and age
Royal queen seed sweet skunk age 31 days

-Climate: Temperatures never exceed 30C with lights on and never below high teens at night. Generally 20C

- Light used: HPS 600W * 3

-Additional info: I did, after noticing the issue, pick the leaves off and feed with the 6.5pH feed. However more leaves on all the plant have done the same thing. So I'munsure if it pH or not.

--Pictures:

 

[SweetSkunk]

There is this AFN Infirmary Patient Form. If you would fill it out and post it here along with pictures of the whole plant under natural light, you would ensure you get the kind of help you want.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Thanks mate, I've posted above. Should I post it elsewhere?

 

[MedGrower]

For a 31 old plant this is a very large one! I think that this plan is going through its cycle very fast and it seems the affected leaves are at the bottom. Many strains do this naturally, some more and some less but it seems to me there is no cause for alarm here.

Keep watching that pH situation as it could also be somewhat of a shock reaction to low pH.. Top and middle part of the plant looks to me very happy and healthy and anything major would surely be seen there.

But dont take my word for it, lets have soil grow experts give it a look. I am just a hydroguy and not qualified to give trustworthy advice. Just wanted to reassure you it doesnt seem bad at all to me.

 

[chefdave]

Pull off nasty leaves on bottom and continue on checking ph in nutrient solution. Matter of fact I would just clip the lower branches off ( 2 or 3 sets) they are not going to do anything but produce airy weak popcorn buds. This also allows nutrients and energy to concentrate on tops where your light is strongest. That's a tall leggy plant for 31 days. Do you see sighn of flowering yet you should have by now. This is a autoflower plant right?

 

[SweetSkunk]

For a 31 old plant this is a very large one! I think that this plan is going through its cycle very fast and it seems the affected leaves are at the bottom. Many strains do this naturally, some more and some less but it seems to me there is no cause for alarm here.

Keep watching that pH situation as it could also be somewhat of a shock reaction to low pH.. Top and middle part of the plant looks to me very happy and healthy and anything major would surely be seen there.

But dont take my word for it, lets have soil grow experts give it a look. I am just a hydroguy and not qualified to give trustworthy advice. Just wanted to reassure you it doesnt seem bad at all to me.

Pull off nasty leaves on bottom and continue on checking ph in nutrient solution. Matter of fact I would just clip the lower branches off ( 2 or 3 sets) they are not going to do anything but produce airy weak popcorn buds. This also allows nutrients and energy to concentrate on tops where your light is strongest. That's a tall leggy plant for 31 days. Do you see sighn of flowering yet you should have by now. This is a autoflower plant right?

Thank gents. Sorry for the delayed reply, 13 hour days and then the plants to deal with leaves me very little time.

I've kept the pH ar about 6.7 in the feed. I have e clipped some of the lower branches and taken the nasty leaves off.

They are REALLY tall. I kept the lights as close as I could and moved them up with the plants (if the plant got too close it, the light would go up) but some of the plants are exceeding the lights.

They are autos. Sweet skunk autos by royal queens seeds.

Some of the plants are well on their way to flowering. Some of them still lacking. Please see pics.

Thanks again, really appreciate your help.

 

[Waira]

.....
For sure the acidic soil kicked lockout and uptake problems off, hence the fans getting tapped out like this so soon,... what your pH is going in doesn't reflect what the actual in-pot pH is, too many other influencing factors in there! .... also, are you actually adjusting the AN nutes pH, or is that what the pH is normally after mixing? ....never adjust nute solution pH with AN, they strongly frown on that....their whole schtick is "self-adjusting" pH--in solution only, not once in pot,...
So the question remains, is the in-pot pH still off? Testing straight run-off is not accurate at all, in case you were doing that,... part of the leggy build is the HPS color spectrum, not the best at all for veg' period,... Are you using any Ca-Mg? .... those bowed curled leaves at the tops,.. smacks of a bit too much N as well,.. AN has an odd NPK balance as is, and if you're tinkering or using a light dosage, with little to no other products, you could be coming up short of other nutes,....

 

[Rev. Green Genes]

their whole schtick is "self-adjusting" pH--in solution only, not once in pot,...

what they did is create conjugate base and acid pairs that are stable at around 6 pH. Quite a chemistry trick, considering all the other minerals we toss in there that could get in the way or catalyze an opposing reaction.

@SweetSkunk I Waira is right, that's nitrogen cannibalization causing the yellowing. Do you have a foliar spray? When I get lock out I spray daily till the pH is back to perfect.