Leaves turning yellow and getting spots

[AF420]

Hey guys, I used epsom salt last irrigation, 2 tsp in a gallon of water and I fed the girls with that in order to add some Mg and stop the issue, I want to update pictures that i took today cause I’m not sure if it really is a Mg deficiency.... I know that leaves that were harmed are not getting back to normal so these pics are not an indication that is not a Mg deficiency but maybe you can see something else...

some of the upper fan leaves are starting to show same symptoms and I don’t want to loose this entire garden

thanks a lot

 

[Campesino]

It is more likely Ca than Mg. It really looks like bad Ca deficiency. Epsom will not correct Ca problems.

 

[AF420]

As my understanding Ca deficiency starts in younger (upper) leaves, this plants are showing symptoms in the older (lower) leaves and continues going up.

 

[Campesino]

I am aware that Ca problems usually show in areas of active growth. Not usually the very top, but symptoms first appear on larger fan leaves as they finish growing. I am quite confident that Ca is your problem... Not only do the symptoms match, but also because I know that Coco will cause this problem.

You don't have to follow my advice, but that is it

 

[AF420]

Don’t get me wrong, I appreciate your advice, I’m just trying to figure out what the hell is going on because I’m using exact same products and grow soil components and nutrients than before in my other plants in wich I never had problems like these. That’s why I’m so confused cuz I actually used coco in the same amount as before.... I’m buying some dolomite tomorrow and hope my girls get better... Thanks for your time

 

[Campesino]

No worries. I hope I didn't stray from being friendly

I understand the frustrations of just wanting to figure out the plant problem. I can tell you that unbuffered coco will all be somewhat different. It is not surprising to me that you would have success one grow and problems the next. Or only have problems with certain plants on a particular grow. In the future, I'd recommend getting a pre-buffered coco product. Or learn how to buffer it using organic ingredients. My buffering process is not organic.

Here is a link for further reading
https://growguru.co.za/blogs/hydroponic/buffering-coco-coir

 

[Campesino]

Using Coco that has not had it’s complex buffered is going to create a very unsuitable grow medium for any plant. The positively charged cations such as Calcium and Magnesium are going to have a stronger attraction to the Coco complex where it will become unavailable to the plants and nutrient lockout will occur. This will cause Potassium and Sodium, which are less attached to the complex, to be displaced into the solution and be taken up by the plants instead of Calcium.

Calcium is crucial for a plant’s growth and is involved in almost every aspect of a plant’s development. Your plant will show Calcium deficiencies in a few different ways if you pay close attention. New leaves may appear crinkled and distorted while they might also show dead spots where the leaves will turn brown and die-off.

https://growguru.co.za/blogs/hydroponic/buffering-coco-coir
same link as above

 

[AF420]

Thanks bro! You were very helpful.. I will definitely consider buffering coco for the next time and maybe adding some perlite too. I’ll post if something continues to go wrong

 

[Campesino]

You're welcome! I really hope that it resolves your issue and they recover

 

[AF420]

It’s been a few days now since i used epsom salt and dolomite lime to fix the CalMg deficiency but symptoms are getting worse. A few leaves have died and fallen and one of my plants is almost with all yellow leaves. The indicas stop their growth. They have grown only around 3 cm or less since I started flowering. I’m on 4th week now. Any clues?

 

[Trichomefarmer88]

Looks like nitrogen deff. Really... I've been wrong before tho lol good luck

 

[Chefbjy]

Epsom salt will increase your potassium and with the k cations in coco I suspect it's getting too much which will prevent uptake of ca/mg. So your npk is out of wack and should have probably run a good flush to correct it before adding the salt and lime. These ingredients break down over time with subsequent watering and will still release their beneficials into the soil. A flushing agent will release the nutrient bonds and you can start over with proper npk ratios...being in mid bloom you want to take it easy on n though. My 2 ¢ .

 

[Campesino]

I missed this earlier - its been 9 days! I hope they are still going!

Yeah, the issue is certainly more than just the Ca that it looked in the first set of pics. I agree with Chefbjy that the NPK is out of whack and it might be causing issues with adsorption of N - because Trichomefarmer88 is also correct , those yellowing leaves at the bottom look like low N.