Mg Def or Nute Lock?! *PICTURES*

I'm not sure if they have a Mg def, im using ionic grow for my 3 week old cuttings some of the bottom leafs have started doing this.

Part of the leaf has gone yellow then turned brown. The veins are still green though. Hope some one can offer me some help

How'ya doing? It looks like some type of lock out or possible burn/ph issues~
What's growing medium/hydro/dirt/nutes and what size pots or
whatever your into? Would be helpful in determining your problem~

Im using rock wool and they are just in trays at them moment I am watering them by hand. The PH is fine.

What can I do to help them?

How big is the rock wool? What nutrients and how much of them?
Did you pretreated the rock wool? Soaking it in 5.5 water for an hour at least
I do it longer! And bigger I have some in 7 gallons of rock wool.
They call this hillbilly hydro How do you plan to grow this?

are you sure ph is fine?as thats what usually causes lockout in the first place.in rockwool it needs to be as close to 5.8 as possible.
it does look like a Magnesium deficiency,have you been overfeeding tho?

http://www.drugs-forum.com/growfaq/1382.htm

take a pic of the whole plant

MrGhettoGrower said:

How big is the rock wool? What nutrients and how much of them?
Did you pretreated the rock wool? Soaking it in 5.5 water for an hour at least
I do it longer! And bigger I have some in 7 gallons of rock wool.
They call this hillbilly hydro How do you plan to grow this?

Click to expand...

the rookwool is 3inch.
i pre soaked the rock wool in the ionic grow. it says to add 7ml of ionic to 1 ltr of water. I soaked in 6 ltr of water.

plan to grow using 60ltr nft system sodium lights and red spectrum flourecents.

off to take some pictures

IMO i think its a phos toxixitity i would flush your medium 3 - 4 times its volume with light feed MJ loves phos but to much will interfear with calcium,copper,mg,zn up take

can you tell me that again in its simple way as I dont really understand the lingo on here yer

flush your your rockwell 3 times with a light nutrient mixture

what are you feeding it and how much??

I think your just underfeeding it

the plants raing from 3-6" the roots were so they were transplanted from 1" cubes to 3inch cubes that the go into the nft system.

No it doesnt lower the ph, just has everything in it the plant needs to grow, I have to balance the ph myself using ph up and down. my tap water ph is 6.2 i thought that was fine as that is what is says on the ph card.

should i flush them?
If so for how long?
How do i flush them?

thanks guys, there are alot of little plants needing your help!

I just updated 1st post with two pics of full plant

I just wonderd how it could be under fed,
I pre soaked the with the nutes and they are still wet.
I am watering them by and at the moment till they are 10 inch then they will go in the nft system on 12/12

It looks a little overfed to me i would flush it with plain water 1/4 strength feed also it looks ok on new growth might of been from when the plant was using some stored nitrogen to help grow an root

Look bro nobody here KNOWS what the problem is, can only speculate. Your the one whos been messing with it the whole time, your going to know if you've been over watering, over feeding, ect. Several things can cause deficiencies or the appearance of them. Prime example my plant looked like it had a Cal/mg deficiency at first, which evolved into a phosphorus deficiency, the obviously remedies were not working to fix the problem. Turned out the water i was using was "hard" and had excessive amounts of calcium and mg already in it, which caused my soil to lock out the phosphorus, so it was'nt really a deficiency at all. Its things like that you need to consider. Your best bet would be to flush the soil well, then on next feeding give it the normal dose it requires. If your over feeding you will notice things will keep getting worse, if your under feeding you will notice the deficiency progression slow down over then next week but not correct itself. I have a feeling you may be having something cause lockout of another nutrient. I dont think its over feeding because a key thing to remember is, nutrient burn or over feeding of something will show in the new upper growth first, where a deficiency will appear in the lower older foliage first, like yours..which means the plant is'nt getting certain nutes from the soil so its taking it from the older bigger leaves

Thank you, I'm just flushing them now, i'll just have to go through it. Its my first time with cutting that i have taken myself.

Sorry if i upset anyone, i'm a woman and im confused!!

your alright and it's ok to be worried, rockwool is a pain in the arse