Mag def?

[keke.nz]

Hey,

I have 4 White Widow and 4 Power Skunk(TFD) which I think might have a Magnesium deficiency?

The specs of my room are:
2 x 600watt HPS (70cm from canopy)
Growing in 50/50 compost and potting mix from gardening store
Feeding them Earth Juice Grow at 1ml/Ltr and CannaExpress Nitro at 1ml/ltr. The PH of the water they get is between 5.5 and 6.5. The run-off was tested today at 6.0. I water them everyday 1 ltr and feed every second watering.
The temps in the room are ranging from 65-90F im thinking, I lent my friend my thermometer but will get it back today for a more accurate range.

The tips of the new growth are very yellow. On the fan leaves the yellowing is not so dense but more spread.

Heres a picture of a fan leaf.
http://www.icmag.com/ic/album.php?albumid=6960&pictureid=116074

Any help would be appreciated.

keke

 

[keke.nz]

BUMP

keke

 

[Peksman]

Yp Mg deficiency. Probablly caused by overfeeding.

 

[keke.nz]

Thanks Peksman,

So I should cut back on the nutes a bit? Those dosages are the recommended ones.

peace keke

 

[Hazy Lady]

You could do with raising your ph a touch, ideally soil grows want to be around 6.6 to 7.0 more nutrients are available to your plant in this range and it should sort things, meanwhile you could give some Cal-Mag, Epsom etc to green them back up.

 

[keke.nz]

Hazy Lady thanks, I will raise the PH to more of that range. I watered the plants with epsom salts yesterday so should green up in the next few days?
I have also just swicthed them to 12/12 this morning so its all ON! Just wanted to get the problem cleared up before the big switch.

Thanks alot
keke