First growth (semi- stealth) - yellowing leaves ?

[The Grim Reefer]

Now i say semi stealth as it hidden in a locked room, but if u go into the room youll see a grow tent so its semi stealth lol.

Ok have 6 plants (big buddha cheese from feminised seeds) growing underneath a 400w MH lamp inside a 1m square grow tent (the tent is about 2m tall)

Plants were looking great up until about a week ago where leaves around the bottom of the plants started yellowing, and wilting. This is only happening in 4 of the plants, as the 2 others were a late decision to include them (germinated 8 plants first took best 4 plants then decided to take another 2 aswell about 2 weeks later). Now at first i thought it was over nuting, but ive cut out all nutrients am just feeding with water with a ph in the low(ish) 6 mark, using test strips so down have anything exact. But ive cut out all nutes for over a week now n no sign of anything changing, the ph seems to be correct, and i dont think its pest or fungal attack as it only on the bottom leaves of the plants, and hasnt spread (at all) to the upper leaves (well really its affect just the bottom 2 rungs of leaves, above that is perfect, and plants are about a 320mm tall atm.) This seems to be about to happen to the 2 newer plants with both plants new leaves at the bottom seeming to be a little yellower.

Any insight greatly appreciated, Cheers

EDIT: The plants are on an 18/6 light cycle dont know if that makes a difference

EDIT2: This is a soil grow sorry, when i said grow tent i just ment a tent made for gorwing, that houses the plants. there are six pots inside all using soil.

EDIT3: Pics now indcluded below

[comrade]

I don't know if this is your problem or not but I read an article on a hydro hut manufacturers recall because some of the materials used were causing wide spread plant death.

[The Grim Reefer]

this is a soil growth sorry added to last post aswell ty for reply.

[AugustWest]

very tough to tell without any pics man.

so the yellowing is starting from the bottom up?
Do the leaves turn fully yellow before they wilt and die?
what brand or mix of soil are you using?
how big are the pots and how long have they been in there?
What nutes were you giving it?

sorry for all the questions, just trying to get it straight lol

[The Grim Reefer]

My appologies for no pics, parents borrowed digital camera.

Yep yellowing is starting from the bottom up

Yes leaves fully lellow and brown before they die, although they are wilting while being a bit green aswell.

Brand of soil - BioBizz Light Mix [LINK]

The pots vary unfortunately 3 are 150x150mm square pots (all of these are affected)
3 are 200x200mm square pots (1 of these are affected, as the 2 newer plants arent affected at present - well startings but nothings turned proper yellow lol)

Nutes -
Bio Grow Liquid Plant Food [LINK] at 3 ml per litre
Ammonium Nitrate (NH4) - 4%
Nitrate (NO3) - 4 %
Phosphorus (P205) - 2%
Potassium (K2O) - 6%

Alg-A-Mic Vitality Booster [LINK] at 3.5ml per litre
Nitrogen (N) - 0.1%
Phosphorus (P2O5) - 0.1%
Potassium (K2O) - 0.1%
Calcium (Ca) - 0.2%
Magnesium (Mg) - 0.1%
Bio Heaven Plant Energy Booster [LINK] at 3.5 ml per litre
Nitrogen - .91
Phosphor - .18
Potassium - .24
Calium - .28
Magnesium - .20
Iron - .017
Manganese .001
Zinc - .002
Borum - .018
Copper - .0001
Molydenum - .0001

Anything else you need/can think of that may help ?

EDIT: Added nutes in bold as my formatting didnt go through to the actual post

EDIT 2: Added links for the nutes aswell.

[AugustWest]

sounds like a Nitrogen def.
how long since you transplanted them?
Do you know the PH of your soil?

if your PH is inline i would add some of that "bio grow" formula you have at 50% of what they say to use.
Keep an eye on the new growth.. as long as it seems to be growing at a steady pace and looks healthy they you should be all set. The yellowed leaves will eventually die ooff so don't worry about them.
If it's been a while since you transplanted, then a new (larger) container of fresh soil will do wonders.
best of luck man.. i'll keep an eye here incase you have more questions.

[The Grim Reefer]

No havent checked the pH of my soil, will do that. Its been about a 4 weeks since i transplanted em id say, and the 2 newer about 2 weeks.

EDIT: oops he he, so its nothing particularly bad to be worrying about, none of the leaves have circular or patterned yellowness so wasnt thinking it was pest, and cant see and fungal growth. and since it hadnt spread to upper leaves but was happening with all that it was nutes, the bottle says 2-4ml per litre so ive been using 3, would you think to drop that down to say 2 or even 1 ?

[AugustWest]

i'd add 2ML per Litre and see how that does.
Is it just the plants that have been in the pots for 4 weeks that are yellowing?
again really tough without pics and soil PH, but it does sound like Ndef if it's a uniform yellow with no circular "PH" patterns.

[The Grim Reefer]

yes its just the 4 week plants, will ring my cousin and see if he can get a digital camera for the evening, will hopefully be back with pics and a soil pH, cheers for the time August.

[AugustWest]

anytime sir.. best of luck.
i'm gonna say N def if it's only on the older ones.. if it were PH i'd assume everything would be effected.

[The Grim Reefer]

Ok found a digital camera to use, have lost my pH indicating solution so no soil pH as of yet, hopefully this'll help the diagnosis

The first 2 show leaves that have shriveled and died (there are i think 4 of these leaves altogether) the second two are showing the yellow leaf, this partivular leaf is the worst affected at this stage, theres maybe 2-3 of these per plant (of the 4 others) at different stages. The second last pic is of 1 of the newer plants whose leaf is beginning to yellow. The last pic is of the 6 plants together a view from the top to show how the yellowing hasnt spread, and also for comments on the plants themselves

EDIT: In the group shot the 2 newer plants are the two centre plants.

[The Grim Reefer]

another question as im here, ive two more plants growing under a 45 watt Fluorescent tube, was going to keep these just under that untill these 6 had gone through harvest and maybe doing something with them then, another mh lamp is out of the question, so should i just scrap em or leave em grow away, if pics of them are needed i can get them , just a side question my main question is still the topic above

[The Grim Reefer]

updated with pictures of the 2 lads underneath the light., also a mini bump

[hexter19]

Augustwest For President In 08!

[andyduckets]

Originally Posted by hexter19

Augustwest For President In 08!

hes got my vote---