Sick plants 🪴 need advice please

[bb420sd]

Could anyone give advise on what could be the issue here. Ph is fine, temps 20-27, canna a+b 20ml/10litre. Roots look good.

They were doing really well until a week ago but I've not changed anything. Any advice appreciated

 

[ninjadip]

I'm not sure man! I don't know anything about coco

The first picture looks like magnesium def.

But I can't explain the other ones, looks like something drastic changed. What are you feeding them?

 

[Moshmen]

How many fertigations a day ? How much ? Looks like a watering issue to me?

 

[Zill]

Mosh,
That what I was thinking

 

[bb420sd]

How many fertigations a day ? How much ? Looks like a watering issue to me?

There is no dry cycle just 2inch clay pebble in bottom of each pot and water constantly available but it's been this way for years no issue. The only thing that's changed is switched to the maxibright leds I thought maybe light too intense but turned down to 50% and still no sign of recovery. I think it is a feed issue but not sure why it's 120litres of water and 240ml of canna a+b as I've always used without fail

 

[bb420sd]

I'm not sure man! I don't know anything about coco

The first picture looks like magnesium def.

But I can't explain the other ones, looks like something drastic changed. What are you feeding them?

Yeah seems like some sort of lockout as they are feeding alot slower now but the feed is just simple canna a+b

 

[Einsteins]

How many fertigations a day ? How much ? Looks like a watering issue to me?

Looks like he is using autopot, which means the plant drinks when it wants (bottom fed).

 

[Einsteins]

Was your coco buffered?

 

[bb420sd]

Was your coco buffered?

Yes.

 

[Anthem]

Lighting can and will change a plants nutrient needs. If you look at your second picture there are some leaves with brown spots below the top of the plant. That is a calcium Def. But you do not want to feed just calcium as Calcium and Magnesium need to be controlled. So your answer is Cal Mag. Start out adding 7 mills per gallon of cal mag. There are products that do no use calcium nitrate for the calcium portion of the feed. Grow more makes a product that is called no n cal mag. I would recommend that product at 10 mils per gallon and go from there.

 

[bb420sd]

Lighting can and will change a plants nutrient needs. If you look at your second picture there are some leaves with brown spots below the top of the plant. That is a calcium Def. But you do not want to feed just calcium as Calcium and Magnesium need to be controlled. So your answer is Cal Mag. Start out adding 7 mills per gallon of cal mag. There are products that do no use calcium nitrate for the calcium portion of the feed. Grow more makes a product that is called no n cal mag. I would recommend that product at 10 mils per gallon and go from there.

Thankyou will give it a shot

 

[bb420sd]

Lighting can and will change a plants nutrient needs. If you look at your second picture there are some leaves with brown spots below the top of the plant. That is a calcium Def. But you do not want to feed just calcium as Calcium and Magnesium need to be controlled. So your answer is Cal Mag. Start out adding 7 mills per gallon of cal mag. There are products that do no use calcium nitrate for the calcium portion of the feed. Grow more makes a product that is called no n cal mag. I would recommend that product at 10 mils per gallon and go from there.

The root uptake has improved alot and drinking as expected now, hopefully a sign of recovery. Thanks