HELP! Upper leaves problem!!! DWC HYDROPONIC!!

[kakolukia]

hi all. this is auto cinderella jack 11 weeks old by dutch passion seeds.
my setup is:
30 liter water reservoir
2 air bubblers
2000 watt led grow light (light similar to 1400 watt HPS)
740 cfm fan
lights are 24 hours on
i use Genera Hydroponics flora trio + hydroguard, tap water with 120 tds. PH is 5.8

plant is really big and bushy. 3 days ago i noticed that upper leaves are loosing color and have some dots.lower leaves not affected yet. i thought it was light burn since started spreading from upper leaves and moved lights far away but it didint help. i checked for bud rot but i couldnt notice any mold or change of color where affected leaves meet stem. there are 3 more weeks to go until harvest. please help identify problem...

[Toker1]

Is your PH always 5.8? Or do you let it fluctuate between a range?
also, how often are you adjusting your PH?

[kakolukia]

Is your PH always 5.8? Or do you let it fluctuate between a range?
also, how often are you adjusting your PH?

i check ph daily and i let it fluctuate but i've been keeping it under 6 last 2 weeks. im not pro this is my first ever grow

[Toker1]

I get mine to 5.5 let it swing up to 6.5 before adjusting. I adjust 2/week.

[kakolukia]

Is your PH always 5.8? Or do you let it fluctuate between a range?
also, how often are you adjusting your PH?

u think it may be a cal deficiency since it cant be absorbed under 6??

[Toker1]

Could be. Try letting her swing between 5.5-6.5. I have always had good results with that.

[Cali]

kakolukia no pro either but from my experience it looks like cal/mag deficiency. I noticed that problem in my last grows . I use regular tap water which should have enough cal/mag but I add some to my nutrient water anyways and the problem went away

[kakolukia]

kakolukia no pro either but from my experience it looks like cal/mag deficiency. I noticed that problem in my last grows . I use regular tap water which should have enough cal/mag but I add some to my nutrient water anyways and the problem went away

my tap water ppm is 120-130. how much ml cal/mag should i add per gallon ??

[Toker1]

If the PH adjustments don’t fix the issue... then start exploring cal-mag.

[kakolukia]

my tap water ppm is 120-130. how much ml cal/mag should i add per gallon ??

set ph now at 6.25 and added 1ml of calmag per gallon. see what happens next. thx

[Cali]

Sounds good I just do 1ml per gallon but towards flowering I take it down to half and then 1/4. My Tao water is about the same as yours maybe a bit higher close to 200 ppm

[kakolukia]

i searched for similar problems and now i suspect it could be phosphorus def because i just noticed that the steams of affected leaves turned red. steams of healthy ones are green so its not caused by strain genetics so now i think its P deficiency. any thoughts??

[Toker1]

What is the PPM reading on your solution? And when was your last reservoir change? If you are using the general hydroponics feed schedule provided on their website... then yes, you should PH down to 5.5 and let it swing back up to 6.5 before adjusting it again.

[kakolukia]

reservoir change every sunday. no i am using feeding chart provided by growweedeasy.com. ppm now is about 550...

[Toker1]

This is what the manufacturer recommends.

http://gh.growgh.com/docs/Feedcharts/GH_FloraSeries-REC_03216am.pdf

[Juicyj89]

Calmag for sure