Is this mg deficient?

[tommyromano]

i have been using scultz mix, and i know theyre known for MG problems.
Temps: 69.0 - 78.0
Hum: 25 - 45% (winter time)
strain: bubba kush (GHS)
PH: 6.2 - 6.3
light: 400 watt hps
Nutes: second feed using Sensi Grow A/B Advanced Nutrients.
started feed: fourth Inter node up, two and a half weeks from seed
plants: about 4th week in VEG

I started noticing the middle leaves started to get yellow spots and then turning grayish black. and the lower leaves seem to be losing there green colour and there turning yellow/white/ lime green. now im thinking its a MG def. but it can also be from Over water or over ferting. Please help
PS: they have also been curling up like ram horns, and a few purplish/red stems here and there.
Thank you
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[Mother's Finest]

Use Mg for Magnesium as MG means Miracle Grow around here. A Ph of 6.2 is too acidic for normal soil. It shouldn't go below about 6.5. Acidic soil can cause lighter shades of green and other problems. Try to take pics under normal lights as the HPS gives the pics an orangish tint that makes it hard to really see problems. What little damage I can see, the little rough looking areas between the leaf veins, could indeed be from Mg deficiency. It's always a good idea to use more than one fertilizer type/brand since no single fertilizer has the perfect levels of nutrients for every plant.

They also seem to be Phosphorus deficient, which can cause upward curling, crispy, dry patches on the leaves and slight stem reddening. Most stem purpling is from genetics, though.

 

[haloman420]

I think they are going through a little stress going from one product from another. Just let them get adjusted for about a week and let us know.

 

[biggun]

Have you ever flushed in the 4 weeks ?... Or try a foliar spray using some epsome salt, 1 tsp per gallon. When you water, only water when they are completely dry, wait till they start to droop a little.... Peace

 

[MIOMIOMI]

Try the epsome salt spay and also back off the amount of nutrients you are using and see if that helps. You might also want to measure the ppm. Keep in mind that this is also the early sign of Septoria infection and you should add H2O2 to nutrients too, also spay the plants with H202 (hydrogen peroxide).

 

[Snow Crash]

I think it looks like pH spotting.

They will be fine as long as you keep your pH in line. Get it back to 6.5.

 

[tommyromano]

Have you ever flushed in the 4 weeks ?... Or try a foliar spray using some epsome salt, 1 tsp per gallon. When you water, only water when they are completely dry, wait till they start to droop a little.... Peace

that was my next step. I'm going to buy some tomorrow morning, ill let everyone know

 

[tommyromano]

Thank you so much for your imformation