Problem With The Plant. Calcium Deficiency?

[Vetrushka]

Hello! I am a complete novice in growing and hope to get help.
I want to apologize not understand much English and use the dictionary.

My garden is illuminated by HPS 250 watts, at a distance of 25-30 cm. The temperature is in the light period is 24-26 degrees at night, 17-20. Humidity ranging from 40-60% (day / night)
Plants grow 2 Bubble kush and Sweet Skunk on RQS. The problem is only with Bubble kush.
The flower is 40 days of germination, the problem appeared at the beginning of flowering.
Use products BioBizz: Fish mix, BioBloom, Activera, Alg-a-mic and Top Max.
PH of the reconstituted solution is within 6.5 to 6.8. Lift with Sodium bicarbonate.
Pots are 18 liters of soil BioBizz Lite Mix.
Put in 3ml. of all products, giving each watering put fertilizers. 4 days ago I made washing with 10 liters of pot with half the amount of fertilizer.
Then showed magnesium deficiency. Does anyone have an idea of what is due. I think that it comes to calcium deficiency?

 

[Seamaiden]

Good catch! I agree that it's a Ca-. You can do two things to arrest the issue here--apply a Ca-only product as a foliar, and gypsum. I'd start with about 1T/gal, watered into the pots.

Keep in mind that all you can do here is stop the progression, the necrotic areas will not come back.

 

[Vetrushka]

Thanks a lot, tomorrow will take preparation with calcium.
Gypsum will put the next watering are still wet. To put it on top and fingers fly?

 

[Seamaiden]

Top dress and let it get watered in when the plant needs it. You don't need to start another problem caused by overwatering. :)

 

[Vetrushka]

Hello, yesterday I put gypsum. I'll wait a week and I will say what the outcome.

 

[Vetrushka]

Thank you very much, I think there is improvement!

 

[Seamaiden]

Beautiful! :) No sign of deficiency there at all.

 

[Vetrushka]

Once again thank you. Everything is fine and I am close to harvest. :smoking:

Bubble Kush (auto) of 64 days.

 

[Cjr22288]

I think I may be having a related issue. I'm about two weeks into my veg and over the past four days or so my plants have started dropping and getting a brown sort of pigment to them. Think this could be a calcium deficiency?

 

[kronic19]

Here