SERIOUS DAMAGE ? LED 7TH WEEK FLOWERING YELLOW/BROW LEAVES

[Ganggreen]

AMNESIA HAZE
7th week of flowering ( DAY 48 )
fluence leds 70cm from the top of the plant at 98% power
temp is 29•C/84.2•F by day - 23•C/73.4•F by night
tap Water is EC 0.2 (tds500 is 100-ECx700 is 140)with temp 18.5 •C /65.3•F
watering is:
EC 0.6 (ppm500TDS is 300)(ppmECx700 is 420)
after nuts and BLOOM A/B water is EC 1.2 =(ppmTDS500 is 600)
(ppmECx700 is 840)
PH 6.5 (comes from veg 5.7/5.8 FLOWER 6/6.1/6.2...etc)
50% soil 50% coco
humity is below 60%
CO2 is 1500ppm today
Extraction runs 15mins per 1 hour lowering CO2 to 470ppm
2 fans in room at minimun for a 4metres X 3metres ROOM
INYECTION FLOW/ 2 filters EXTRACTION no smell (ventilation not seems a issue)

LAST EC MEASSURE/FLOOD from irrigation water full with A/B+ nuts EC 1.2 in 2 taller and 2 shorter plants result 1.3/1.4/1.6/1.6


SOME GENERAL PHOTOS

 

[Ganggreen]

MAYBE A POTASSIUM DEFICIENCY ?

some closer photos

 

[Ganggreen]

the CO2 started day 21 of flowering in the last day 3rd week then some stunt happened, internodal distance and the buds seems to not get closer/ be build as they should

There is a lack of cal/mag with LED but from 0.2 tap water rise it to 0.6 is so excessive so its blocking the potassium absortion ?

some photos of the seriuos damage

 

[Mr.GreenthumbOG]

You adding any calmag to the feeds?
One thing leads to another.

 

[Ganggreen]

Yes I do. before adding the food and estimulants/nuts I rise the EC from the 0.2 that tap flow gives me to 0.6 and then I add the nuts + A and B
after set my irrigation gives me EC 1.2 and the last flooded/ meassure of 4 plants gave me EC 1.2 / 1.4 / 1.6 / 1.6

here the photo of the meassured 1.4 EC after irrigation

 

[Ganggreen]

I add cal/mag to the regular PH water day. Rising it from the original tap water EC 0.2 to EC 0.6 cause that lack of cal mag in LEDS (first time) and read , research and being told about higher EC s applied to LED in sativas. I though being in the carefull side. Got something to do with trigering the CO2 or is casual ?

 

[MIMedGrower]

Looks like too much calcium locked out calcium and now progressing...

 

[Aqua Man]

Yeah way to much calcium... 300ppm??? With just cal mag added... eeesh. Tap is likely close to 80%cal and then adding that much more... not to good.

But I also think there is a lot more going on here.

 

[Ganggreen]

Yeah way to much calcium... 300ppm??? With just cal mag added... eeesh. Tap is likely close to 80%cal and then adding that much more... not to good.

But I also think there is a lot more going on here.

thank you for sharing, what else you think is going on ?

 

[Ganggreen]

Looks like too much calcium locked out calcium and now progressing...

What would you do to correct it? Not add extra calcium and lower the ph ?

 

[Aqua Man]

These in rockwool?

 

[Ganggreen]

These in rockwool?

NO its 50% soil 50%coco

 

[MIMedGrower]

What would you do to correct it? Not add extra calcium and lower the ph ?

flush some out and use as needed. I don’t know how to manage 50/50 coco/ peat. I was warned to keep coco content under 30%. Maybe calcium is the tricky part ?

 

[Ganggreen]

flush some out and use as needed. I don’t know how to manage 50/50 coco/ peat. I was warned to keep coco content under 30%. Maybe calcium is the tricky part ?

I think so..triying to figure out...I am flushing with liwer ph and not EC

what you mean " coco under 30% " ?

 

[MIMedGrower]

I think so..triying to figure out...I am flushing with liwer ph and not EC

what you mean " coco under 30% " ?

not to add more than 30% to peat mix.

 

[JSH1973]

When I did my first grow I always measured the tap water EC and then used CalMag to bring it up to 0.4, I was having something similar but on much smaller scale but you are 50% higher on the base even before nutes.
I was growing in Canna Coco Pro Plus mixed 70/30 with Perlite and using Canna nutes though so not exactly a like for like comparison

 

[Ganggreen]

thank you for sharing. the nutes/food AB you been using what amount of calcium have?

When I did my first grow I always measured the tap water EC and then used CalMag to bring it up to 0.4, I was having something similar but on much smaller scale but you are 50% higher on the base even before nutes.
I was growing in Canna Coco Pro Plus mixed 70/30 with Perlite and using Canna nutes though so not exactly a like for like comparison