Strange Problem, Please Help!

Please, can someone help me to identify these problems?

The PH is around 6.5, when the problem starts the soil was neve fertilized, so i measure the Ph and it was correct, so i use Peters 30 - 10 - 10, and another day i use 1 soup spoon of manesium sulfate (Epson salt).

And the problem didn't solve...

So, whats wrong with that soil??

Thanks a lot for your help!

Sorry about my english, i live in Uruguay, so my natural language is Spanish. And Uruguay is now Full cannabis free and legalized

Hi Digo,
Clearly the plant leaf pattern is from Mg deficiency. But the question becomes...is it a simple deficiency or is there an absorption problem. Your ph sounds good. Did your feeding make the plant worse?

Is the soil aerated with perlite or anything else to allow good drainage. Marijuana doesn't like compact soil. Was the soil a rich organic mix or just some random topsoil?

With a deficiency so advanced, it may take quite awhile to catch up with the Mg. I'd say, keep giving the Epson salts every watering and maybe add nutrients every other feeding at about half strength and wait and see. Oh and make sure soil dries pretty good between waterings.

Sorry I can't offer more,
JD

beat me to it JD!!

As jd said.... mag. is the problem here. peters; 30-10-10 sounds like it may be a bit strong, so definitely go 1/2 or even 1/4 strength when fertilizing. Something else Ive found that will help with mag def. is a foliar spray to the under side of the leaves, once or twice a day. This is only a temp fix and is not going to cure your soil problems.

How much have epsom salt do you mix in the water? for your case, I would mix a heavy dose like 2 tablespoons in a gallon (3 liters) for 2-3 waterings. Then cut the ratio way down to 1-2 teaspoons per gallon, after 2-3 waterings with the strong mag dose. let dry up really good as jd said.

I find I have to add epsom salt about every week, even with all my macro and micro nute ferts. seems to keep everything green and fast growing!!

And any type of deficiency on small plants, is always a good sign you may need to upgrade your soil. perlite, vermiculite, will help with drainage and keep oxygen in the soil. and dont forget to add some hydrated lime in your soil right in the beginning, it will help with ph, calcium and magnesium. good luck man!!

Yes, you have "nutrient burn/toxicity - flush for at least one week and re-adjust you feeding (lower). If you feel you have "nutrient lock-out" then you need to foliage feed, this will fix the problem if that is want it is. Think it's more of a toxicity (to much)

so how big are the pots you have them in?? is that the same plant or a different one? looks like it may need a bit bigger pot, a 1-2 gallon pot for a 1-2 ft plant is a good rule. I only use fert with 30-10-10 outside in the ground. inside I like to use something close to 5-2-2 (not sure what exactly what the numbers are but close to that)

@Harris Hawk,
I was just curious why you are so confident that this is nute toxicity. I agree it does look like a lockout, to be so severe...but it could be an advanced deficiency.

He's only fed once...and shouldn't there be more leaf tip involvement if nute burn?
JD

Hello !

Tanks a lot for the awnsers !

I presume that it's a nutrient hungry, now i'm using 2 soup spoons of Magnesium Sulfate on 2 liters of water, well mixed and i aplly with a pump pulverizer expecting a foliar absortion.
2 times a day. I bet that my soil has very low nutrients.

Just another doubt, when the plant gets better the bigger leafs that is yellow will turn to green again or it will still just like that?

Gracias for all your help! I'm learning a lot.

Thanks!

digo,
Magnesium, like Nitrogen and a few others are called mobile nutrients. That means they can move around within the plant. So once your plant starts catching up on Mg...the leaves should normalize. However, some lower leaves that have been severely deprived for quite awhile will probably brown and die. A few have already done that...judging by your photos. Good luck and I hope they improve rapidly.
JD

Dago,Feed it veg nutes more often. Ph has to go in at 6.5, calibrate your meter. Its very N and Mg def.

JohnDee said:

@Harris Hawk,
I was just curious why you are so confident that this is nute toxicity. I agree it does look like a lockout, to be so severe...but it could be an advanced deficiency.

He's only fed once...and shouldn't there be more leaf tip involvement if nute burn?
JD

Click to expand...

my feeling is the roots have been burned and therefore the plant can't take up the Mg it needs. peters and all outdoor ferts need to be recalculated for an indoor rate. the rate is half for indoor use. if the plant were mine, i would cut it back by half, remove from the pot and cut away all dead roots. then repot into a nice neutral mix. no ferts until it puts out new roots then the half rate after that.

Hi everyone.

I'm back and unfortunately i aint got good news.
I'm trying to do everything that was told, using a magnesium solution foliar, no results, and i recalibrate my Hannah PH meter, and the Ph is around the same, 6.3.
I try to use 1/3 of the indicated dose of Peters, and then after i had used 2/3 of the recommended dosage, but the problem persists and no signal of improvement, and the upper leaves are still yellowing.

Bet that this soil that i bought is trash, my soil composition is 40% coconut fiber washed and sliced, and the other 60% is that national soil. It was writed on the soil package that the Ph is regulated, had a good and balanced nutrient level, and everything, but i bet that this was a lie.

So now i will gonna put the plants on the 12 / 12 light, so they can show the sex, and after that i will try to save with a change of soil (transplant) only the women and childrens first! hahaha

After that i will post new pictures. Thanks a lot folks!

Good luck......hope u get them turned around.

There are several charts out there with pictures of what plants look like with the different deficiencies. Do a google image search for "cannabis deficiency chart". it should be one of the first things that pops up.

I

digo563 said:

Hello !

Tanks a lot for the awnsers !

I presume that it's a nutrient hungry, now i'm using 2 soup spoons of Magnesium Sulfate on 2 liters of water, well mixed and i aplly with a pump pulverizer expecting a foliar absortion.
2 times a day. I bet that my soil has very low nutrients.

Just another doubt, when the plant gets better the bigger leafs that is yellow will turn to green again or it will still just like that?

Gracias for all your help! I'm learning a lot.

Thanks!

Click to expand...

I would give her 1/2 magnesium for gallon n my nutrients of at 1/4 for about 2weeks n bump her up from there slow slow bro