Yellowing leaves,dark spots

[MesaBoogie]

Problem: Yellowing Leaves with Dark rust spots

Medium/grow method: Sunshine Mix#4

Feed: and supplements used: Jakes bloom,micro,grow series (local company). Calnesium

water source: Tap water, PH 6.1 -6.4

Strain/age: Dinafem White Cheese auto 41 days old

light used: Viparspectra 900w(400ish actual watts.) Viparspectra 300w (100ish actual watts)

Climate: 79-81

Additional info: It looks like a cal/mag problem so I have been feeding them 1ml/liter Calnesium for 2 weeks now and the problem is only getting worse. I flushed today with just plain water 6.2 ph. Any help would be greatly appreciated. I included a pic of 3 week old Femaleseeds White widow/big bud auto that is starting to show the same yellow spots.

Thank you.

 

[GoAuto6]

Is your tap water well or city? Pictures in natural lighting would help.

 

[MesaBoogie]

Ty for the reply. It is city water. PH out of the tap is around 6.2 and 330 ppm . I usually let it sit 24 hours. Here is another pic.

Thanks.

 

[GoAuto6]

I usually like pH up around 6.5 to 6.8.. the thing with city water is chlorine will evaporate buy chloramine will not. Get ahold of the water company for a read out of your water. Your under LED do you add extra cal-mag led seams to suck up the cal-mag.

 

[MesaBoogie]

I started to add Calnesium to the last 4 waters @ 2ml/liter and foliar feeding them 3x a week. There seems to be no improvement and leaves continue to deteriorate. Should I up the calnesium feed ? or move to a different product ?

Calnesium:
N: 2%
Ca: 3%
MG: 1%
FE: 0.1%
ZN: 0.05%
MO: 0.0005%

here is a link to my "water quality characteristics"
https://www.saskatoon.ca/services-r.../drinking-water/water-quality-characteristics

Thanks.

 

[GoAuto6]

I think you need to transition to some flowering nutrients. Lower N and higher K on the N-P-K reading... Looks like your still feeding veg nutes, and get you pH up. I bet if you probe the soil you'll find out it's down around 4 and your also locking out nutes.

 

[MesaBoogie]

I think you need to transition to some flowering nutrients. Lower N and higher K on the N-P-K reading... Looks like your still feeding veg nutes, and get you pH up. I bet if you probe the soil you'll find out it's down around 4 and your also locking out nutes.

You definitely busted me on the veg nutes ! The flowering snuck up on me and I've only given them 1 lower dose of the bloom regiment. I flushed them with just tap water today, my next feeding will likely be in 4-5 days when I will hit them with a full dose. My schedule is 2x water + calnesium, then 1 feed. Works out to less than 1 feed per week. Because of small plants in 5g pots, I did not water to runoff until my last couple waters. I am thinking now that was a mistake. Feedings are to far apart now as a result of slow root expansion ? I will make sure to up the PH on my next feed, but I am unable to check the soil ph . I have tried 2 rapid test soil ph meters, but turned out to be junk ! I see a lot of people mention accurate 8 meter, but amazon.ca doesn't carry it

 

[GoAuto6]

At this stage I would say keep the dose to half strength but alternate feeding and watering to every other one. And if you just flushed I'd go head and do a feeding till run off.. are you sure your soil is completely saturated no dry spots?

 

[MesaBoogie]

yea I really soaked them in the kitchen sink earlier today. Wifey wasn't lookin !

I'll hit them up with the goods tonight and report back in a few days with some nicer lookin plants I hope.

Thank you very much for all your input.

 

[GoAuto6]

Most the time it's suggested to do a light feeding after a flush, as you need to replenish the nutrients.. I also siggezs getting a soil probe, the accurate 8 is the best tool in the shed. EBay has them for around 60$. But well worth it.