Autoflowers 3ish weeks from start of flower, was cruising along, now this

[ShadySwashbuckler]

Hi guys

i had an earlier post on this, my first grow in its first few weeks, and received some mind-easing advice

i have so much work into this, i hate to see it falling apart here as i get closer to the end *see pictures attached*

the issue seems to affecting the high up newer growth with the lower older groth still looking strong
the affected leaves feel rigid for the first time during the grow

one of the things that is puzzling me is that when i test the PH of my runoff it seems much lower than it should be...?
so i have been feeding nutrients in dechlorinated tap at PH 5.8 on average, sometimes a bit lower, sometimes a bit higher.
runoff has been testing at 4.6-5.0 only when i have gone heavy at 6.2 have i seen runoff at 5.2ish

is this ok? if not what could be causing it?

my EC i'm keeping in the 1000-1100 range but thats with 350 EC hard water as the base, my understanding is that autoflowers take lower nutrient levels?
the per gallon mix im at now if it helps is

• 2.5 ml cal mag
• 2.25 ml micro
• 3.5 ml bloom (i'm done with grow nute at this stage)

• Durban Poison Autos from Dutch Passion
• mother earth coco perlite
• General Hydroponics 3 set of nutrients
• now at 40% humidity and 75F

I will post additional pictures or give additional info that someone feels could help guide me

 

[Merlin1147]

my EC i'm keeping in the 1000-1100 range but thats with 350 EC hard water as the base, my understanding is that autoflowers take lower nutrient levels?
the per gallon mix im at now if it helps is

• 2.5 ml cal mag
• 2.25 ml micro
• 3.5 ml bloom (i'm done with grow nute at this stage)

I’m a little confused. (No surprise there). Do you mean your Fertilizer is in the 1000-1100 ppm range and your tap water is 350 ppm? The fertilizer level your at is really low Like 130 ppm NPK. Not seeing how your getting the added 700 ppm with that formula. The GH Grow is good for getting the K up so your ratios are where they should be without adding a load of P and N. You May be seeing K deficiency. Not sure what is going on with the ph. I don’t grow in coco so can’t help you there.

 

[ShadySwashbuckler]

Those numbers are electrical continuity, not parts per million.
Parts per million numbers are roughly half that.

 

[Bernie420]

Those numbers are electrical continuity, not parts per million.
Parts per million numbers are roughly half that.

What is your ec or ppms exactly?

What light are u using?

 

[Bernie420]

Those numbers are electrical continuity, not parts per million.
Parts per million numbers are roughly half that.

If its an led light then I say your light is too close and it washed out all your mag in the top of the plant.
up your light. up your mag

 

[ShadySwashbuckler]

1010 EC

And yes, a pair of mars hydro sp250 LED

I can modify the stand that they are on to make it lower and get me some more room up top.

Think that's the issue huh?

 

[Capn-Crunch]

I keep my SP250's at about 18 inches all the way through the grow

 

[Merlin1147]

Those numbers are electrical continuity, not parts per million.
Parts per million numbers are roughly half that.

Ok so you meter in measuring in microsiemens not millisiemen. That makes sense.
Stil looks like k deficiency.

 

[Bernie420]

1010 EC

And yes, a pair of mars hydro sp250 LED

I can modify the stand that they are on to make it lower and get me some more room up top.

Think that's the issue huh?

yes and that you have been low on mag in general, I wouldn't try to do anything about it at this point just to raise the light up.

How far away was the light? Was it 18 or less like the other person said.

 

[ShadySwashbuckler]

Couple of the plants got about 8" away from the tallest bud.

But the plant showing the worst is about 16"

 

[Bernie420]

Couple of the plants got about 8" away from the tallest bud.

But the plant showing the worst is about 16"

Raise the light to 20 inches then.

The worst plant with the highest light setting is kind of a whatever situation, that plant may be a fast grower and had less mag applied and or used more mag faster than the other plants. Might of been in the middle and got the strongest amount of light in relation to the other plants, idk.

 

[Kushash]

Hi guys

i had an earlier post on this, my first grow in its first few weeks, and received some mind-easing advice

i have so much work into this, i hate to see it falling apart here as i get closer to the end *see pictures attached*

the issue seems to affecting the high up newer growth with the lower older groth still looking strong
the affected leaves feel rigid for the first time during the grow

one of the things that is puzzling me is that when i test the PH of my runoff it seems much lower than it should be...?
so i have been feeding nutrients in dechlorinated tap at PH 5.8 on average, sometimes a bit lower, sometimes a bit higher.
runoff has been testing at 4.6-5.0 only when i have gone heavy at 6.2 have i seen runoff at 5.2ish

is this ok? if not what could be causing it?

my EC i'm keeping in the 1000-1100 range but thats with 350 EC hard water as the base, my understanding is that autoflowers take lower nutrient levels?
the per gallon mix im at now if it helps is

• 2.5 ml cal mag
• 2.25 ml micro
• 3.5 ml bloom (i'm done with grow nute at this stage)

• Durban Poison Autos from Dutch Passion
• mother earth coco perlite
• General Hydroponics 3 set of nutrients
• now at 40% humidity and 75F

I will post additional pictures or give additional info that someone feels could help guide me

You are using GH micro that has Calcium in it.
You are using hard water. Hard water usually has a lot of calcium in it, might want to get a water report or mix some RO water in to thin it out.
Next you are adding cal/mag.
Could be to much calcium.