Green Crack Autos - day 52 - Calcium deficiency?

[Hebrew 68]

So all 3 of my GC auto plants are now on day 52 and all now seem to be showing the same unhealthy signs.

Is this perhaps a Calcium deficiency? I have a box of epsom salts in the cupboard, should I add some of this to the next watering?

 

Below is an old fan leaf from the smallest of 3 plants, now beginning to show similar signs as the other 2 have shown. I think it will start yellowing like the other 2 have soon;

 

And here is a leaf from one of the 2 larger plants where the issue is more developed and widespread.

 

[catweazle1 4,903]

What medium are they in? Epsom salts is magnesium sulphate.

[Hebrew 68]

2 hours ago, catweazle1 said:

What medium are they in? Epsom salts is magnesium sulphate.

They are in soil - BioBizz All-Mix. I'm growing under LED, I have good extraction/circulation, and I have been feeding them with BioBizz Grow and Bloom.

I guess epsom salts won't help me unless I have a mag deficiency then.

 

I'm just trying to work out what the issue is so I don't repeat the same mistake on my next grow.

[Guest theokoles]

When did you start feeding them? looks like a typical example of lockout due to over feeding, you dont need to feed in allmix for the first 4 weeks, if you started feeding at week 2 or 3 i'd say its a salt build up causing lock out and id just plain water for 2 weeks then go back to feeding.. im sure someone will come along and tell you whats really wrong though..just my best guess...deficencies 9 times out of 10 are caused by lock out due to overfeeding.. dont try to correct by chucking more shit at them is my advice.. im happy to be told to piss off though if wrong  

 

the other possibility is cold water, make sure its tepid.. i use bottle water for the first 3 weeks, until established, hardly any chance of fucking things up that way.. i never feed until at least week 3 to 4. autos can be extra sensative to early feeding and hot soil.

 

Edited November 25, 2020 by theokoles

[Slippy One 11,665]

Turn the LED's down a touch. Biobizz are known to have deficiencies. 

[Hebrew 68]

16 hours ago, theokoles said:

When did you start feeding them? looks like a typical example of lockout due to over feeding, you dont need to feed in allmix for the first 4 weeks, if you started feeding at week 2 or 3 i'd say its a salt build up causing lock out and id just plain water for 2 weeks then go back to feeding.. im sure someone will come along and tell you whats really wrong though..just my best guess...deficencies 9 times out of 10 are caused by lock out due to overfeeding.. dont try to correct by chucking more shit at them is my advice.. im happy to be told to piss off though if wrong  

 

the other possibility is cold water, make sure its tepid.. i use bottle water for the first 3 weeks, until established, hardly any chance of fucking things up that way.. i never feed until at least week 3 to 4. autos can be extra sensative to early feeding and hot soil.

 

I started feeding them at day 23. So far I have been feeding them 1ml of Grow and 2ml of Bloom per litre of room-temp tap water (that's been left out for at least 24hrs).

I had no issues until about 2 weeks ago, when some of the older fan leaves started yellowing. I ignored it at the time, thinking that was natural at the stage of flowering I am at.

But now, I am starting to get new growth with brown spots that I'm sure will start yellowing soon.

 

Next grow, I plan on using rain water instead of tap water, perhaps my PH (around 7.4) is too high even and its causing a lockout.

[Guest theokoles]

@blackpoolbouncer this is your man Hebrew

[Guest theokoles]

1 hour ago, Hebrew said:

 

Next grow, I plan on using rain water instead of tap water, perhaps my PH (around 7.4) is too high even and its causing a lockout.

 

i use bottled water for the first few weeks... Cant go wrong then, for a couple of quid its a no brainer imho.. anything to give them the best start in life.. i switch to tap water when they are a bit more established 

[OctoMan 420]

Looks a bit like a phosphorus deficiency to me.  How much grow and bloom are you feeding? Are your watering procedures and root temps dialled in?

[Hebrew 68]

10 minutes ago, OctoMan said:

Looks a bit like a phosphorus deficiency to me.  How much grow and bloom are you feeding? Are your watering procedures and root temps dialled in?

1ml Grow + 2ml Bloom per litre of water. I water around every 4-5 days till runoff with a pressure sprayer. They get around 4 litres of water each at the moment.

My temps are always stable (between 23-28c).

[OctoMan 420]

Not sure them mate.  Maybe a little light on the bloom for this stage but I'd wait to hear from someone who uses these nutes.  Hope you figure it out. 

[Hebrew 68]

On 25/11/2020 at 7:58 PM, OctoMan said:

Not sure them mate.  Maybe a little light on the bloom for this stage but I'd wait to hear from someone who uses these nutes.  Hope you figure it out. 

I have just finished watering. I have increased the amount of bloom.

Now giving 1ml Grow + 3ml Bloom per litre.