New Grower Is this a calcium deficiency?

[Greengrower]

Hi guys!
Here's my dark devil auto.
7weeks old and she's looking beautiful (colours are really showing on underside of leaves)
I believe this is a calcium deficiency.
I thought it could be a phosphorus deficiency but she has slightly burnt tips (even though I feel I'm underfeeding regarding my soil and nutes. Biobizz light mix, biobizz grow (stopped now) and biobizz bloom).
So could anyone confirm if this is correct please and also what would be an organic solution or as close to possible please so I don't mess with the soil and the 'microhead/microheard' I can't remember which is correct lol.
Thanks!

 

[Greengrower]

Bump

 

[Greengrower]

I feel like she's getting worse.

 

[Not-a-cop]

Hey, sorry to see you’re having trouble with your girl.
You need to fill out This form is a prerequisite for getting help here, the “doctors” need the full picture before being able to make any kind of reasoned diagnosis


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!

 

[Greengrower]

Problem: discoloured leaves, I believe to be a calcium deficiency.
Medium: soil; biobizz light mix with additional perlite
Feed: biobizz grow .5ml/L (stopped now) biobizz bloom 1ml/L
Water is straight from tap, once nutes are mixed the ph ranges between 6.7 and 7 unsure on EC/TDS
Strainark devil auto - 7weeks old.
Climate: lowest temp 17c, highest 28c
Lowest Rh 40% highest Rh 70%
Light: Mars hydro 600w led
Symptoms appeared about a week ago but have progressively got worse and is infecting more leaves as time goes on. Infected leaves also look worse as time goes on.

 

[Waira]

Tips like that can be from several things, not always nute burn, just commonly so,... At your feed levels, no way, not with BB nutes....underfed if anything, and as you see by the worsening, stopping feeds has not helped at all... get back on the feeds ASAP...
A check of the actual in-pot pH is warranted too, forget what you hear about "organic" nute lines and not needing too, it's BS,... Not adjusting the feed solution, yes, unless it's badly off and then that becomes a question about what you water is like... And what is your waters TDS(ppm) or EC? If it's known to be very hard water, that's a potential issue...
Look for the Accurate 8 soil pH probe (called a meter wrongly BTW), or the identical unit under different brand names outside NA,...
Symptoms are mixed, P and Ca, others lurking I bet... They interact with each other, and Ca is critical for many things including uptake/transport... hard water may have a lot of CaC03 in it, but it's lockout up, not available Ca++....

 

[Greengrower]

Tips like that can be from several things, not always nute burn, just commonly so,... At your feed levels, no way, not with BB nutes....underfed if anything, and as you see by the worsening, stopping feeds has not helped at all... get back on the feeds ASAP...
A check of the actual in-pot pH is warranted too, forget what you hear about "organic" nute lines and not needing too, it's BS,... Not adjusting the feed solution, yes, unless it's badly off and then that becomes a question about what you water is like... And what is your waters TDS(ppm) or EC? If it's known to be very hard water, that's a potential issue...
Look for the Accurate 8 soil pH probe (called a meter wrongly BTW), or the identical unit under different brand names outside NA,...
Symptoms are mixed, P and Ca, others lurking I bet... They interact with each other, and Ca is critical for many things including uptake/transport... hard water may have a lot of CaC03 in it, but it's lockout up, not available Ca++....

Thank you again Waira! Ppm of my feed is 440 going in and that's with 2ml per litre of biobizz grow. I will look into a probe asap, would measuring the run off not be the same?