Leaves Turning Brown - Drying Up- HELP PLEASE - PICS

I've had these two clones of super skunk under a 250 hps for 25 days now. Things have been going fine, and one plant has become a monster and is very healthy. The other one is problematic. For a while the leaves started turning slowly yellow, now they are getting brown spots and are ended up cracking and totally dry. The only thing I can think of that I've done differently is that I added a bit of water that hadn't sat 24 hours during my last water (probably about 2 cups) . Other than that I've been keeping my ph around 6.5 - 6.8 . Also I haven't given them their full nute dose yet (I've been giving them 1/4 and up to 1/2 the recommended dosage since i was worried about burning them). I'm using biobizz vegetative nutes and a soil mix properly phd. The thing that is strange to me is that the other girl is doing so well. Could this be a fungus? It's not from heat because the leaves most affected aren't directly in the hot spots of my lamp. Should I be cutting the problem leaves off?? what should i do???? The new growth is bright green and looks healthy but the older leaves are getting all fucked up. HELP!

maybe a cal or mag deficiency but not for sure. i had this happen with my plants where the older more mature leaves on the plant would yellow but the new nodes were perfectly healthy. i had nute lock out and used some epsom salt with my waterings and that seemed to help some but not totally fix the problem.

Thanks for the quick response. How much epson salts should you add with a watering? Here are some more pics of the girls next to each other, and another close up of a leaf.

I was looking up this symptom yesterday. Came to the conclusion that I had a Magnesium def.

I watered with 1/4 teaspoon Epsom Salts per Gal. (From the GROWFAQ) Im nearing the end of flowering so I don't know If Ill really see any difference.

For me it was the new growth on the underside of the branches where the leaves started the brown spotting and eventual death.

ok. should i be cutting the leaves off that are turning brown or just leave them till they die? once again thanks for your quick responses.

i let mine just die and fall off into the pot. i think they provide nutes to the plant. not to sure, hasn't hurt them yet though.

Just let them die and fall off naturally.

Ok. Just updating. I went and got some magnesium mix to add to my last watering and now more leaves are turning yellow, drying up, and dying. I added less than the recommended amount just so as not to shock them. They aren't getting better. Anyone else have any ideas what is going on here? I'm on the verge of cutting them and starting over. Any experienced growers out there. please help.

anybody? this can't be that strange of a problem

Think thats the same as mine do/did.

I decided it was too much nute build up in the soil & plant. The plant can only use so much depending on its size & rate of growth...

I tend to use water only for a couple of consecutive days a week to help flush the plants & soil, & dilute any build up.

just an update in case someone else encounters this same problem. It was a magnesium deficiency after all. I got a bio magnesium additive (im growing in soil) and put it in with my next watering. I also misted the leaves which were turning yellow, brown, and dry. Within two days the girls were back up and stronger than ever. Almost couldn't believe that I brought them back from the edge of death, but now they're bushy as hell again.

This SAME problem is also happening to my plants. BAD. lots of leaves r browning from the inside out and cracking to the touch. I thought they were just dry so i been spraying the leaves every so often. I dont know what it is. Eventually they fall off. The new buds r looking nice n green but some r starting to show brown. how do we fix this??

I have read alot of calcium and mag deficiency. I am growing in rockwool......does this look like the same problem??????
Please advice any....pg. 3 shows the brown spots. rest of plant seems to be healthy and green. not sure what humidity is......need to check. ph is at 5.7ish. 1/4 nutes and flushing 3x/week.
https://www.rollitup.org/newbie-central/177860-10x10-medicinal-hydroponic-grow-room.html

Mr Minger said:

Think thats the same as mine do/did.

I decided it was too much nute build up in the soil & plant. The plant can only use so much depending on its size & rate of growth...

I tend to use water only for a couple of consecutive days a week to help flush the plants & soil, & dilute any build up.

Click to expand...

this is whats happening to me, too many nutes with not enough Mg in the nutes, so you are getting mg def. and also locking your roots

flush with 1T of epsom salt and start with like half the nutes you were using on the next watering 3-4 days later

rizzo69 said:

this is whats happening to me, too many nutes with not enough Mg in the nutes, so you are getting mg def. and also locking your roots

flush with 1T of epsom salt and start with like half the nutes you were using on the next watering 3-4 days later

Click to expand...

I just flushed today for what i believe was mag def myself. I didnt use as much epsom as you so i hope it still fixes it. To be safe i think 1/2 tsp of epsom will be apart of every watering for now on.

Anyone know whats so special about the botancaire cal/mag?

dude this is your problem i had that exact issue and thats what it is.. Its a magnesium deficiency caused by a pH lockout. If your pH is under 6 it will cause an Mg lockout and thats what your leaves will do starting from the bottom, to the top.

If you have a TDS(EC) meter and pH tester and you are using nutes, make sure you are setting the pH AFTER the nutes! the nutes will drop your pH intensly. I had the same problem, I was doing it the other way around, I would set my pH to 6.7 and then set my nutes to 500 ppms and feed to to my plant without knowing that the pH after the nutes were added was actually like 5.4-5.5, causing my Mg deficiency.

Flush it with pHd water until water is coming out of the bottom, wait 4-5 days until its completely completely dry and you will actually already notice that you will be able to bend those dry cracked leaves again without them breaking, after the soil is dried out, give half strength nutes, THEN set your pH and see what happens

To be safe if u want, also u can spray your plant with epsom salts

sorry if i repeated anything anyone just wrote but i just wanted to give my 2 cents quick

read what i wrote above, forget my first post, i have been doing some serious reading and this is my conclusion now, read ther post above this one

rizzo69 said:

read what i wrote above, forget my first post, i have been doing some serious reading and this is my conclusion now, read ther post above this one

Click to expand...

Thanks man.

I ended up flushing then feeding again 3 days later even though the soil was still soaked. I was starting to get yellow tips in my new growth which is why i didnt wait until the soil dryed out. I felt like the yellow tips were from the lack of food. Not sure. Im using a soilless mix so hopefully my roots can withstand the wet environment. Anyway, i went ahead and bought the Cal-mag plus and didnt use the epsom. Will let everyone know how it turns out. Ive read cal mag plus is a must have if youre using distilled and/or a peet based medium. Im using both. The tap that i was using may have made matters worse too.

Hi,

looks like i`m having the same problem. A week ago i noticed little brown dots on the first "real" bottom leaves (not the round ones). Afterwards the damaged leaves dries out. Tried adding mg sulfate solution, but i see no changes. Maybe you can give me some advice? I added two pics - one, with the brown dots; other, where the leave has already dried out.

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View attachment 2406156always handy