Day 58 Autoflower - Yellow dotting on a couple of leaves

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Nilspoulsen

Active Member
First grow ever - day 58 coco grow in a 5 gallon pot. Usually watering once every two days until runoff. Last watering input which was this morning was 1490 EC pH of 6.01 Feeding Big Bloom and Tiger bloom with calmag.
Run off was 1800 EC runoff pH 5.7. Had no issues at all until I went home for thanksgiving and left her on an auto watering system. I had it water everyday but not enough to make it runoff. This was partly because the thing I got off amazon couldn't water long enough so that I could keep it on the same watering schedule and I didnt want a bunch of water sitting in there adding to the humidity. Anyways got back after 4-5 days and there was a little bit of runoff in there that read at 4000EC and I noticed some burnt tips as well when I got back. Flushed it with pH'd RO water until runoff read 1000 EC.
Ive started to notice like 2-3 leaves around the same bud sight with these yellow dots all over the leaves and they also feel more brittle than the others.
LED lights 20 hours on 4 hours off for a while now - 22 inches from top and pretty sure light recommends even closer when flowering but I just havent lowered it for some reason. No main cola because I snapped it right off on day 20 something. If you have any advice Id appreciate it real bushy plant only about a foot tall. Really want some good dense bud so point me in that direction please lol.
Humidity 40-50% usually 45- Temps from 78-82 during lights on.
 

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C.U.R.E

Member
Nice looking lady! So in a constant feed system, such as coco or hydro, magnesium is in constant demand. Sounds like they got over watered, over nuted, and cal mag deficient. Let it dry then water her with 2000ml ro water with 5 ml slf-100 and 2ml flawless finish (or Epsom salt with no additives if you had too). You may have to do that for up to 3 days until you start to see a change, then resume as normal only add a bit of epsom salt when you nute and slf-100 at least once a week on flush day. Use flawless finish again a week or 2 before harvest on flush. Tps nutrients also makes a canopy boost that contains magnesium fulvate for this specific issue though I wouldn't use it in flower.
 
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Nilspoulsen

Active Member
C.U.R.E said:
Nice looking lady! So in a constant feed system, such as coco or hydro, magnesium is in constant demand. Sounds like they got over watered, over nuted, and cal mag deficient. Let it dry then water her with 2000ml ro water with 5 ml slf-100 and 2ml flawless finish (or Epsom salt with no additives if you had too). You may have to do that for up to 3 days until you start to see a change, then resume as normal only add a bit of epsom salt when you nute and slf-100 at least once a week on flush day. Use flawless finish again a week or 2 before harvest on flush. Tps nutrients also makes a canopy boost that contains magnesium fulvate for this specific issue though I wouldn't use it in flower.
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Man honestly that kind of went over my head but ill look into it - Thanks
 
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Nilspoulsen

Active Member
xtsho said:
You don't need Flawless Finish, SLF-100, or TPS whatever.

When you say you're feeding 1490 EC do you mean 1490 ppm? That's too much. Don't flush with RO water.
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No on my vivo sun TDS/EC meter gives me ppm and EC. EC is 1490 or 1.49 EC I believe so that is around 745 ppm. What kind of water should I be flushing with?
 
xtsho

xtsho

Well-Known Member
Nilspoulsen said:
No on my vivo sun TDS/EC meter gives me ppm and EC. EC is 1490 or 1.49 EC I believe so that is around 745 ppm. What kind of water should I be flushing with?
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You don't flush with plain water when growing in coco. Always use a weak nutrient solution.

I'm pretty sure that meter reads 0 - 9990 ppm. If so 1490 is not 1.49 EC but 1490 ppm or 3.0 EC using the .05 conversion.
 
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Nilspoulsen

Active Member
xtsho said:
You don't flush with plain water when growing in coco. Always use a weak nutrient solution.

I'm pretty sure that meter reads 0 - 9990 ppm. If so 1490 is not 1.49 EC but 1490 ppm or 3.0 EC using the .05 conversion.
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It reads EC and PPM depending in what setting it is. that 1490 EC is 745 ppm with the conversion which is just half. Just ppm tested the revivor at 733PPm so EC is a little lower than that 1490
 
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Nilspoulsen

Active Member
Also, unrelated question, I know im very far out from Harvest but does anyone have a ballpark answer for around when I should be harvesting?
 
xtsho

xtsho

Well-Known Member
Nilspoulsen said:
It reads EC and PPM depending in what setting it is. that 1490 EC is 745 ppm with the conversion which is just half. Just ppm tested the revivor at 733PPm so EC is a little lower than that 1490
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What I'm saying is that 1490 reading is in TDS/PPM not EC. You can't move the decimal point and call it EC. Those meters display PPM. You can change the PPM mode to different conversions or use micro and milli-siemens units which will display different numbers that will require a conversion to get the ppm's.

They call them TDS/EC meters because they measure the total dissolved solids using electric conductivity and then convert that measurement into TDS displayed as ppm's. If your meter shows 1490 that's the ppm. It's already been converted. There is no cutting it in half or changing it to 1.49 and calling it EC.
 
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Nilspoulsen

Active Member
xtsho said:
What I'm saying is that 1490 reading is in TDS/PPM not EC. You can't move the decimal point and call it EC. Those meters display PPM. You can change the PPM mode to different conversions or use micro and milli-siemens units which will display different numbers that will require a conversion to get the ppm's.

They call them TDS/EC meters because they measure the total dissolved solids using electric conductivity and then convert that measurement into TDS displayed as ppm's. If your meter shows 1490 that's the ppm. It's already been converted. There is no cutting it in half or changing it to 1.49 and calling it EC.
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It literally says 1490 EC
With the EC next to it I’m not doing any conversions I was just trying to explain
I guarantee you it is 1490 EC not PPM
 
twentyeight.threefive

twentyeight.threefive

Well-Known Member
xtsho said:
What I'm saying is that 1490 reading is in TDS/PPM not EC. There is no cutting it in half or changing it to 1.49 and calling it EC.
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It's reading EC. The 1490 EC is in μS/cm which is 1.49 mS/cm. It's the same thing.

The cheap pens show μS/cm so the meter doesn't have to display a decimal.

@Nilspoulsen - OP I'd mix a batch of nutrients at 1000 EC on your meter and feed the plants to a ton of runoff.
 
N

Nilspoulsen

Active Member
twentyeight.threefive said:
It's reading EC. The 1490 EC is in μS/cm which is 1.49 mS/cm. It's the same thing.

The cheap pens show μS/cm so the meter doesn't have to display a decimal.

@Nilspoulsen - OP I'd mix a batch of nutrients at 1000 EC on your meter and feed the plants to a ton of runoff.
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Okay I have a hypothesis and would love to hear your inputs.
The PH runoff has been lower than usual which is 6.05
I have been getting runoff around 5.6-5.7
I’ve been looking at this chart where it says that it’s harder for calcium and magnesium to be absorbed in those pH levels
Thinking for next watering to pH around 6.3ish to get runoff back to around 6pH
I’ll attach the chart ive been looking at
Was thinking about cal mag foliar spray but I don’t want to get them on the buds
Let me know what you all think-
Thanks
 

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twentyeight.threefive

twentyeight.threefive

Well-Known Member
Nilspoulsen said:
Okay I have a hypothesis and would love to hear your inputs.
The PH runoff has been lower than usual which is 6.05
I have been getting runoff around 5.6-5.7
I’ve been looking at this chart where it says that it’s harder for calcium and magnesium to be absorbed in those pH levels
Thinking for next watering to pH around 6.3ish to get runoff back to around 6pH
I’ll attach the chart ive been looking at
Was thinking about cal mag foliar spray but I don’t want to get them on the buds
Let me know what you all think-
Thanks
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I don't see a calcium or magnesium deficiency.

I don't spray my plants ever. Definitely wouldn't consider it in flower.

I don't check my runoff for pH either. Focus on what you're putting in.

Plant looks overfed. Too much nitrogen as indicated by the dark dark green color and very slight tip burn on some leaves.

I would consider the overall look to the plant to be semi poor, not by your fault but just by poor autoflower genetics. I've had a couple autos like that, not much you can do but either finish it out or toss it.

Like I said before I'd run low 1 EC nutrient solution through it and finish it off with a low feed.
 
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