Please help ASAP Plants are dying .. Questions

Hello,

Strains being discussed:

White Widow x Skunk
White Rhino x Mazar
THC Bomb
Blueberry

I am doing an indoor grow and experiencing some serious problems with my plants... I am using a high pressure sodium bulb (450watts) on a 21 hour light schedule in an 8x8 room with all the walls and floor foiled for max light reflection.. There are 2 fans in the room to keep the air circulating and the plants are in a mixture of Miracle Grow Soil, Cow Manure & Hummus & Perlite purchased from Lowes (2-1-1) The plants were looking 100% healthy 3-4 days ago but i have been noticing the growth being stunted for the past 3-4 weeks.. I use artesian well water and have been using the same water for years previously.. As you can see the plants are thinner then they should be (The stock of the plants are very thick and healthy, at least 5/8" or 3/4" around in only 4 months of growth from seed..)

My growers guide indicates this is a lack of Magnesium (With pictures to match the ones i uploaded below too, it looks spot on) but i'm not sure... What do I need to add to my plants to save them??? Is it too late?? (It's almost to the top of the plants)

The soil is brand new, but is it possible that i may have purchased a bad batch??

For magnesium deficiencies use epsom salts

Andrew2112 said:

For magnesium deficiencies use epsom salts

Click to expand...

How much & How often??

Yesterday I mixed 1/2 a teaspoon of epsom salt per quart of water (2 liters between 3 of the plants) & today I watered the buckets through until they soaked to the floor..

Should I re-salt again tomorrow or wait? How long do I wait? How can I tell if they are improving? Does this mean they aren't going to die?

Add some calmag to each of your waterings. It states that 2ml per liter of water (Roughly 7ml per gallon).

I start with 2ml CalMag per gallon, then work my way up to the full dose. CalMag will help prevent nitrogen, calcium, and magnesium defficiencies and is generally very safe for your girls at all stages exelcept perhaps late flower.

Try not to put to much nute atleast do it ones every 2weeks.

You can also spray a water/epsom salt mixture onto the leaf to help speed recovery

check your ph runoff. mag can't be absorbed at certain ph. always check ph first before adding more variables.

Ph Lock out