Whats wrong with my plants? N or Mg defficiency?

K

kushgrwr

Member
Hey guys,
I'm on day 35 of flower. OG Kush. I'm in soil, using GH food. 82 deg day / 72 deg night temp. 50-60% humidity, CO2 currently at 1800PPM....

in the last week I've noticed my top leaves going yellow. also the main stems of the worst plants are red/purple. I read a bit about it and found that it could be N or Mg deficiency. I went and bought some Green-up which is 3-0-0 and also ran some Epsom salts through in order to try to correct both possible deficiencies. I also did two water flushes with Grozyme.. The leaves are still going yellow. here's a pic of a few of the leaves that I picked off... what does it look like to you guys?

 
Z

zat

Active Member
Having similar issues too...only I'm still in veg. Will be watching...great pix of the problem!
 
I

imchucky666

Well-Known Member
Nice thought, but quit pulling leaves off.
The yellowing could be from N deficiency, though it usually starts towards the bottom.
If all you are feeding is the 3-0-0, and you didn't divulge the age of the plant, but judging by the leaf size, I would guess a month to month and half old?
I would try feeding it a balanced fertilizer if you are not already.
Here's a couple things you can save to help you in the future.View attachment 2438127View attachment 2438128
 
Shaggn

Shaggn

Well-Known Member
Based on your pic, you have progressive leading to late stage N def!! Next close match is (Sulfur) but u have no twisting of the leaves. Could lead to more def's if you don't correct your nutrient mix. Slight adjustments. Peace!!
 
K

kushgrwr

Member
I've been using the GH program that is on their website with grow/micro/bloom and various additives. I was told to add CalMagic to the feed program because GH is known for having low Mg content in the regular food. So I've added that.

As I said in my first post, the plants are in day 35 of flower after 3 weeks of veg. Could my soil PH be out of order? Or do I need to increase the grow/micro content in my feeding program?

Sorry I don't have full pics of the plants as they are impossible to take with Hps lights on. I'll try to get in there today before the lights go on and take some pics.
 
Shaggn

Shaggn

Well-Known Member
Only other thought is your ph might be out just enough to be slightly locking up some N and MG. I wouldn't change your nute amount if you are following a program. I've never used CalMagic, so I wouldn't know if it might cause problems. Double check your ph and take a sample of your run-off and see if they might be an issue there. Yellowing leaves is natural later in bloom but I don't think it should be doing that just yet (maybe some bottom leaves) but that's about it. Peace!!
 
Shaggn

Shaggn

Well-Known Member
Lol dude!! Your plants are gorgeous. From the looks of it if anything they are completely healthy. Might b a slight def in something or ph off a lil, but over-all. Very nice!!!
 
K

kushgrwr

Member
Thanks it's just weird to see the leaves going yellow like that. Never had that issue before. I'll start with taking soil samples and checking my runoff Ph and Ppm and go from there.
 
Shaggn

Shaggn

Well-Known Member
Ya, if anything something is slightly off. Prolly a Mag issue as you're into week 5. But it doesn't look like it's to bad, as long as it doesn't get worse. Check your ph n ppm run-off and we will c. Peace!!
 
K

kushgrwr

Member
Well tested my run-off and I think I found my issue. I started with clean water that was 6.2 PH and 50ppm. Ran it through a good sample of soil in a pot, caught the run-off and tested it. It tested at 5.5 PH and 450ppm. So I did a feed as per my regular program, at 7.5Ph. Gonna do a water with grozyme next time at 7.5PH again and hopefully raise my soil PH to the desired 6.5 mark
 
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