Mag Def? Best way to treat Pics

Ok im pretty sure i have this narrowed down to a Magnesium deficency. Im growing organic, in soil. 3 seperate strains. Sorry about the hps light, i did my best trying to get good pictures. Im pretty sure its mag since i didnt add any lime or epson salt to my soil and have used very little calmag so far, like 5mg/gal one time. Last watering i added 5ml/gal of calmag from GH and 5ml/gal GH vegan plant booster. Otherwise it is ussually just RO water and a little mollases, unless i make an AACT(EWC, alfalfa, mollases and 24hrs) and i have watered once using neptunes harvest, and only been watering about every 5 or 6 days. I have calmag, epson salts. Should i water with just epsom? or the calmag? should i foliar epsom salts? should i feed along with the epsom salts?Middle leaf shows red vein, wierd growth. This plant has the most red veining, has just started to enter the leaf veins but not the main plant stem.Yellowing between veins on new growthLeaves have some dead spotsMore yellowing between veins and leaf tips curlingMore leaf damage.

(Mg) def to me is yellow veins on a yellow / ing leaf, of which you have , easiest way to cure this is foilar spray,

A tip in the future when you're taking pictures of the plant get a picture of the whole plant I can't judge it by a couple of leaves. Secondly it's impossible to accurately diagnose what is happening if you don't tell us what you've been feeding it what are the environmental conditions as well as strain and media used. If you need help diagnosing it message me some more info.

Ok, does it matter what time I do this foliar spray, lights on off? Some other info, I'm in week 3 of flower and growth has really slowed since the def has shown. Also tested the soil ph and came out 6.5. Should I only do the foliar? Or should I top dress the soil? And should I use the calmag from here on out or should I use epsom salts or both?

I've been underfeeding my plants for a while now and experienced mag deficiency which completely stunted growth for days. As well as phosphorus deficiency. The brand of nutes i bought were useless with P and Mg and caused cloudy water after a while so it's probably not 100% synth.

I mixed up a teaspoon of epsom salts in a gallon of hot water and sprayed under the leaves once a day before the light turned off. Took a few days to recover.



Also correct your problem at the root zone if you have cal mag.

mine get calmag every other watering when im usin ro...if not my leaves start turning light lime green within a cpl weeks

https://www.rollitup.org/newbie-central/779287-2nd-scrog-400w-delicious-cotton.html#post10091050
Heres a link to some more pics to give you a look at the whole grow. They are recent pics.

I listed everything I have used on it in the first post, I can give you exact watering dates and what was used. Strains are delicious seeds cotton candy, seedism taste bud and an unknown seedism ufo. Two plants are in big planter, unknown exact size, aprox 10gal, the other is in a 4 gal trash can. Temps are between 65 and 75. Humidity is low, about 20%, I run a humidifier 24/7 in the room that the air draws from and is between 30 and 40%. I have 2 fans running within the room, one above, one below the canopy. 450cfm can fan, air cooled 400w hps and carbon scrubber. Added a 6500k 85w cfl for a little extra light.

Thanks, ill rep u all when I get home. So epsom salts foliar the next few nights and ill hit em with calmag from here on out. Thanks again, I'm always hesitant to take action, I don't want to overreact and make a bad thing worse. Oh yea I forgot to add, old fan leaves have been falling off the one with red stems and the leaves are still mostly green.

in the last pic it looks like you've got leaf miners. GL

Hopefully not, I looked thoroughly with a jewelers lens for pests and couldn't find any. The necrosis, or is it clorosis? on the leaves just gets dry and dies but mostly stays green.

Yep it looks like mag def, I'd keep it simple and mix a teaspoon of Epsom salts into a 2 litre bottle of water and water that into your plants, repeat every three weeks right through the grow, works every time

Wanted to give an update. Last 3 nights before lights out, I used epsom salt foliar spray, and yesterday was a watering day, so a full dose of neptune harvest fish and kelp 1 tbl per gal and 5ml calmag per gal. The foliar spray has stopped any spread of the deficiency and leaves that were getting droopy have perked back up. Can't tell if yellowing is getting any greener but it isn't getting more yellow and I can see growth over the last 3 days. Overall plants look very healthy, I think I caught this just in time bef ore it could cause any real damage. Oh and no more leaves have fallen off thank you imaginary man in the clouds.