deficiency or something else? Please help!

[high po]

Guys I need help. Please check out the photos.
What do you think? What seems to be the problem?

Plant 1 is Serious - Chronic
Plant 2 is White Label - Northern Lights
Plant 3 is Dutch Passion - BlueBerry

Light 400W MH

90cm by 90cm tent.
1 fan in (air sucked from window)
1 fan out

temp
Day 30 deg
Night 24 deg

P1 and P2 are in 8L pots
P3 Still didn't transfered

As of today P1 and P2 are 4 weeks old.
P3 is 2 weeks old.

Soil is not pre fertilised. It is an non fertilised mix with %20 Perlit.


First 7 days they were fed with water(ph 6.2 - 6.6) only when the pots started to feel lite.
Then I started to mix Voodoo Juice (1/4 of suggested) to ph adjusted water.
After 2 weeks (from seed) First Symptoms started on p2. Green color turned in to light green. Then starting from the tips leafs (older ones) started to dry out (crusty).

P3 is fed only with water (2 weeks old)


3 days ago (last watering) I gave them (P1 and P2) Advanced Nuts GROW A+B 1/4 of what is suggested.
But nothing changed..Yet...

 

[Silicity]

get some cal-mag.

 

[SpicySativa]

Looks like some classic magnesium deficiency to me. Epsom salts will fix you right up (foliar and feed). Or just buy some CaMg+.

 

[scroglodyte]

look a little young for nutes............................

 

[high po]

Do you mean should I flush?

 

[high po]

How much epson salt should I put in 1 liter for foliar ?

 

[superstoner1]

make sure to adjust ph after adding nutes to water. you need to measure your runoff. and keep a close eye on that blueberry, they have a very,very high tendency to hermie.

 

[DeeTee]

I agree, looks like mag deficiency.

 

[scroglodyte]

it doesn't scream cal/mag at me. Po.......you usin' distilled water?

 

[SpicySativa]

Tablespoon per gal should do. So little less than a tsp for your 1-L spray bottle. Do that once, then again in about 3-4 days. Also, start adding some sort of CaMG+ to your water. It clearly doesn't have enough.

 

[high po]

it doesn't scream cal/mag at me. Po.......you usin' distilled water?

No, I use tab water. Its EC is around 300

 

[high po]

Tablespoon per gal should do. So little less than a tsp for your 1-L spray bottle. Do that once, then again in about 3-4 days. Also, start adding some sort of CaMG+ to your water. It clearly doesn't have enough.

CaMag isn't sold here. any alternatives?

 

[Coho]

as noted Blueberry can be a pain in the ass..

 

[high po]

make sure to adjust ph after adding nutes to water. you need to measure your runoff. and keep a close eye on that blueberry, they have a very,very high tendency to hermie.

What PH should my runoff water be? (I always measure my ph. If I add nutes I adjust it before I give it to plant.)