Rapid yellowing with brown spots

[sodangerous]

I'm 3 weeks in since flipping to 12/12, I've noticed a fair amount of yellowing to all plants but not too concerned - they've stretched a lot this time so the bottom half of the plant is a fair way from the light.

However one of the plants is yellowing at the top of the plant with brown patches.







Anything else I should be looking at? Manganese / magnesium / nitrogen deficiency?

I've upped feed to 3/4 strength today (Hesi soil nutrients).

[joker_the_smoker]

What soil using?
What you currently feeding them? An how much per L

[localhost]

Same as joker said, also what kind of lighting are you using?

Are you growing in Soil?

[sodangerous]

They're in soil, Dutch Pro lightmix.

4 plants under a 600w HPS.

Using Hesi soil nutrients, upto now I've been using them at half strength.

I'm giving them 5L per plant which sees around 10-15% runoff. Alternate between a plain watering, and a feed.

Same routine / setup for my last 4 grows and not had this before.

[Bddonkey]

Hmmm have you been taking photos in my groom?

[sodangerous]

Did you get yours sorted mate?

[joker_the_smoker]

They're in soil, Dutch Pro lightmix.

4 plants under a 600w HPS.

Using Hesi soil nutrients, upto now I've been using them at half strength.

I'm giving them 5L per plant which sees around 10-15% runoff. Alternate between a plain watering, and a feed.

Same routine / setup for my last 4 grows and not had this before.

Can u expand on the hensi nute feed... how much of what per litre...

The light mix will be runnin out of certain elements the plant needs. I guessin an increase on grow maybe be needed but cant say till have all info

[Bddonkey]

Did you get yours sorted mate?

Still working on it but with BL on the case i'm very positive

[localhost]

They're in soil, Dutch Pro lightmix.

4 plants under a 600w HPS.

Using Hesi soil nutrients, upto now I've been using them at half strength.

I'm giving them 5L per plant which sees around 10-15% runoff. Alternate between a plain watering, and a feed.

Same routine / setup for my last 4 grows and not had this before.

Hmm did you grow different strains last times though? Certain strains can react differently.
Has the yellowing of leaves worked it's way up the plant? Or started at the top?

[sodangerous]

There's a few around the bottom which I presume is normal yellowing due to lack of light. It's periodically around the top.

Hesi flower feed suggests 50ml per 10L, so I've been giving them 12.5ml (5L would be 25ml).
http://www.hesi.nl/l_english/blueh_en.php

I give them the powerzyme at full strength - 2ml per litre.
http://www.hesi.nl/l_english/powerzyme_en.php