Grow Mediums leaf issues, can anyone help?

[dwcgardener]

Hi you knowledgeable people,
Can anyone have a look at the photos and see if anyone can help me out?
Its in a 4 gall DWC. Nutes are pH perfect Bloom and micro (running at 310 ppm with 74ppm on original water). temps 19-25c. 22hrs lights on 300w dual cfl.
I have a static fan in the grow tent (6x4) which I think is not providing enough air circulation so possible light burn?
It only seems to be affecting the larger fan leaves!
I would be grateful for any help or input

 

[Chester]

r u only using two of the three parts of the ph GMB fertilizer ?

 

[dwcgardener]

r u only using two of the three parts of the ph GMB fertilizer ?

No i was given advice only to use the micro and bloom and not to bother with the grow!

 

[Heavily Medicated]

I think you have a nutrient problem. What is the pH? I think I read somewhere that even with pH perfect nutes, you can have problems if your water has a real high, over 8, or real low, don't remember the low level, starting pH, and/or if the water has a really large buffering capacity because of "contaminates". With the original pH Perfect they would only guarantee success if you used RO filtered water, I think. I would start using the 'grow' portion of your nutrients, and keep using right up until they stop stretching, then switch over the the 'bloom' segment. A little Cal-Mag Plus may be in order by the way they look to me.

 

[Dazed]

I would say you have a slight Mg def there bro.

 

[dwcgardener]

I think you have a nutrient problem. What is the pH? I think I read somewhere that even with pH perfect nutes, you can have problems if your water has a real high, over 8, or real low, don't remember the low level, starting pH, and/or if the water has a really large buffering capacity because of "contaminates". With the original pH Perfect they would only guarantee success if you used RO filtered water, I think. I would start using the 'grow' portion of your nutrients, and keep using right up until they stop stretching, then switch over the the 'bloom' segment. A little Cal-Mag Plus may be in order by the way they look to me.

Thank you for the reply my pH runs at 5.8 (check daily) and I will let it creep up to 6.0 as I had seen a table showing the nutr/pH uptake. I was using tap water but ppm was 140 min so switched to bottled water that averages at 74 ppm and also has small amounts of all the nutes needed. I have been putting small amounts of calmag (around 1/3 of total nutes added) when I res change and then when I top up with water I balance the ppm with nutes/calmag..roughly 50/50!
if its the nutes can you suggest a good product/nutes that I could buy for future use??
So its worth upping the dose of calmag at present?
thank you again for the help

 

[dwcgardener]

I would say you have a slight Mg def there bro.

Thank you for your reply I really appreciate it looking like the consensus is mg def..im going to up the calmag and keep the fingers crossed!
are you a dec grower? Could you recommend a nutes product that is as simple as the advanced ph perfect set?

 

[sabreman61]

No i was given advice only to use the micro and bloom and not to bother with the grow!

I use General Hydroponic Flora Series which is a 3 part nutrient solution. Grow,Micro and Bloom. The grow has the most nitrogen in it. Nitrogen is very important during the vegging stage and almost non existent in later flowering stages. I would never skip any recommended nutes. I always use 1/2 of the recommended usage, ESPECIALLY with DWC is what I do too.
Here is my first grow https://www.autoflower.org/f61/hi-all-my-first-af-grow-37161.html
Here is my current second grow which are photo's not autos cause I lost 2 autos due to fungal gnats and fell behind schedule so I got 2 clones from a friend.
https://www.autoflower.org/f61/grow-2-journal-jock-horror-bubblelicious-38286.html

 

[sabreman61]

Also check this out. This is a great thread with some really good pictures of nute deficiencies.

http://forum.grasscity.com/sick-plants-problems/246040-deficencynute-burn-pics.html

 

[Dazed]

Thank you for your reply I really appreciate it looking like the consensus is mg def..im going to up the calmag and keep the fingers crossed!
are you a dec grower? Could you recommend a nutes product that is as simple as the advanced ph perfect set?

I'm sorry I can't. I grow organically brother, but the deficiencies are all the same. I would also check your pH as that is the most common cause of nutrient deficiency problems.

Good luck bro!