ok hands up on this one need a second opinion if u gt five mins 2 spare

[sweetsmoker]

ok so heres the deal nlights x 4 fem nirvana,
1 power kush fem attitude freebie.

5 weeks old from seed

started in rockwool starter cube

potted into 4" pots and rooted nicely for 2 weeks fed twice with formulex plant start, did burn slightly so flushed through and they reponded well, as aresult i give jus water nxt time when i transplanted into 6 litre pots rockwool medium.
they then started showing yellowing and brown edges which i put down to transplant and no nutes for 2 weeks (npk def)
the pots were still heavy so i added a small amount of nutes (1/2 dose vitalink max a nd b formula) as it wud still be a while before due another watering.
plants responde well after a few days and i have since fimmed... about 7 days ago. i have new growth coming through 4 tops on each although 1 is looking odd .
my question is take a look at these pics and give me a experienced answer to what u think i should do next water or nutes, im not an idiot and have plenty of grows under my belt BUT these are th efactors that are confusing my decision making brainwaves since the start temps have been fluctuating greatly ie 29 dwn to 14 c then stabilised but when extraction switches on drops a gd 8c then heats up again i have fan timed at every 3 hrs for half hour its bin so cold out here and its in a shed environment. i also spotted afew ants in my room and sprayed up my plants with a leaf wash formula no ants since then!! apparently aphids often accompany ants
although the plants have responded well since a little feed i noticed that tips are hooked down and there is some little burns on smaller leaves only 1 or 2.. so u assume nute burn yes... however at times the temps have risen briefly to 34.c and i think this has contributed to the leaf tips hooking down in defense to this statement the leaves are also cupping as if to keep in moisture.
also the new undergrowth that has occured has a slow yellowing evenly spread which tells me nitrogen def ie nutes required, hmmmmmmmm

now when these pots are waterd they will not need any more for at least aweek so i do not want to deprive of food but i dont want to feed an burn, these contributing factors as stated above make it hard to make a straightforward decision as some signs replicate two possible causes. ie hooking cud b nutes or heat any one who has gt the time to have a liitle think about this one for me wud be considered a star in my book...

if u wud like to know the specifics of grow then ask but i didnt want to bore ya anymore than i had 2

 

[2rusty]

If they were mine i would feed with 3/4 to full strength nutes and try and get the temps down a bit or move the lights away a bit, looks like some heat stress.

 

[sweetsmoker]

yeah i think u right wit the heat stress m8 i have moved 400w hps back to 2 ft and introduced a 125w blue cfl im undecided wit nutes though, was gunna see wat most said and then draw a conclusion, thnx for yours m8 its appreciated i take it u feel she is nute deprived, thats my inclination as well but the hooking of leaves and yellow sharp tips makes me hesitant ... i have maybe 2 days before she wants a watering, i also noticed that even the new grwth frm the fimming is coming through and leaves turning dwn? heat again maybe? or lack of nitro as they are q light in colour. i plan to flower within a week or 2 so this feed needs to be spot on to get the most outta my veg time

 

[Uk.Cobra]

what rusty said looks like heat stress with some nute burn i would go with rusty said maybe a bit lower like 1/4 strength water next and ween them back on it

 

[sweetsmoker]

k bud thanks for droppin in thats one more view in the frying pan, can i ask though the reasons behind ya decision? not that i doubt u but it all helps to run ya path of thought through my own, all about learning frm others as well as own instincts methinks

 

[Funk Doctor]

could be magnesium def, not sure why its drooping like that in the one pic.........i take it you are quite knowledgeable and its not over/underwatering, the pots looks big enough, so that a bit confusing. i would plan on postponing your flowering if you don't get it sorted soon. raised edges sound like heat maybe, or could be the mg def. definately get the temps sorted and maybe give it some mollases for mg or epsom salts or whatever you have

 

[Reiss]

I think the first question that needs answering is what is your drainwater PH?
If this is off (as can happen when using rockwool) then all the nutes in the world won't help you.

Have a look here (sick plant guide)

 

[sweetsmoker]

i did consider mg etc so i give her some superthrive when transplanting, the little one with real dark green curled leaves is amysery 2 me been like it since seed but still growing same amount of nodes as others i use fem seeds and always seem to gt one like this per grw i jus put it dwn to fcking wit mother nature an weird phenos thanks for ya opinion though buddy i will be holding off flower if i dont get this right this time want the 4 new shoots to have a decnt chance first

 

[sweetsmoker]

reiss cheers fo rpoppin in i seen ya auto grw v inspiring,,,, my tap water is ph 8 but i adjust dwn to 6 using ph kit frm grw shop. the thin with rockwool as u pointed out is that it is completely dwn to me to feeed correctlt as there is no natural feed in the medium this is why i usually have nute def rather than burn but usually keep on top of it q well 2 be honest its why i use it

 

[Reiss]

if you adjust your PH down to 6, adding nutes after this could lower it even more. Do you check the PH of the water that runs out of the bottom of the pot?
PS. I added a sick plant guide to my original post.

 

[sweetsmoker]

no i dont check run off i will do that although it should be ok as i pre soaked the cubes with neutral solution before pottting up. but still cud be a factor best checked also i add nutes to water before i ph the solution. thnx for the attache dthread it is avery useful thread and i have read it thoroughly a few times while toking time away, thnx bud

 

[sweetsmoker]

actually reiss thats a diff thread to what i thought and it is even better thnx for that link, im quite sure i have npk def rather than burn and maybe some nute lock out, i think iwill flush through with half strength grow nutes at ph 6 at least then i have some platform to work from rep 4 that and rep for all who took time out to help any others opinions are still welcomed its nice after helping for so long to be helped bck!!

 

[DaveCoulier]

I have never used rockwool, but they retain a ton of water, and If you are only having to water once a week, Id say you're over-watering. The #2 picture looks like over-watering, and the yellowing of the lower leaves is the first nutrient deficiency you'll typically see from doing so. It also explains the slow growth you're experiencing. I think you would be best to cut back off on the watering and you should see an improvement in your plants. Feel free to check out my 2nd grow album, and you'll see a group picture of what it looks like, and what they look like once I cut back on the watering

Also, do a search here for rockwool. Im sure you'll find some useful info that'll help you figure out a better watering schedule.

 

[sweetsmoker]

thnx dave, i have grwn wit rocwool several times and always experience trouble in veg but awesome in flowering, think this may be dwn to overwatering ? i am v careful with the watering, but it is always a posibility i havent given her water since transplant over 2 weeks ago apart frm about 250ml wit nutes as they looked like they needed a feed due to yellowing out. i wasnt aware that overwatering will make lower leaves yellow thought that was a def, but after reding the usefull thread reiss gave me i see it can contribute to the plants not being able to absorb the nitrogen.. one question though in flood and drain systems isnt the rockwool flooded twicw daily? how is it possible that it works if i can only flood once once every week and suffer frm overwatering... im sceptical that is the prob as also wen transplanting i minimally soaked the cbes as opossed to a thorough soaking . wat do uthink about the yellow new growth from the fimming i can post up 2 date pics if u like although i reckon its dwn to temp flutuation.

 

[sweetsmoker]

ok new development have watered 2 girls with 1/3 strength nutes, leaving other 3 till i see wat happens to the 2, now i seen a liitle scar tissue on some of leaves i had assumed it was dwn to me foliar feeding, but wit close inspection wit a mag glass i can see very sparsely populated litle black dots on underside that seem to be attached to the veins. that i think may be a larvae, has no legs or head and doesnt move at all. i mean there is like maybe 3 per leaf, also on the bigger leaves they seem to be long and thin like a thread of cotton if u like and again seem attached to the veins. not many maybe 1 or 2. a few weeks ago i sprayed wit a leaf wash twice jus to make sure it wasnt pests causing slow grwth as i grw in a shed. do u think i have a pest prob still or r they jus the left overs. like i said they dont move at all and i cant after hrs of research find any bugs that look similar, i have seen fungus nats before and can recognise most pests but these are beyond me any help appreciated will also post in sick plants thread

 

[sweetsmoker]

no i dont check run off i will do that although it should be ok as i pre soaked the cubes with neutral solution before pottting up. but still cud be a factor best checked also i add nutes to water before i ph the solution. thnx for the attache dthread it is avery useful thread and i have read it thoroughly a few times while toking time away, thnx bud

ok so i checked my run off and guess wat its around ph 8 my solution going in is ph6.2 so something fcked up there ,,,, also have spooteed some small black threads and dots under some of my leaves(minimal) i checked as there was some scar tissue on my leaves


i propose gd flush through with ph 5.5 water with half strength nutes bleach out growroom and clean out gd. while flushing spray the fck outta leaves with some leaf wash that i have smc us com premium quality leaf wash,,, its has alreday been used once as aprecursor
if u think im going wrong way about it please post as i will be doing this this evening thnx all or if u have any other advise please stop by and light 1 up

 

[Mr. StankyFingas]

could be magnesium def, not sure why its drooping like that in the one pic.........i take it you are quite knowledgeable and its not over/underwatering, the pots looks big enough, so that a bit confusing. i would plan on postponing your flowering if you don't get it sorted soon. raised edges sound like heat maybe, or could be the mg def. definately get the temps sorted and maybe give it some mollases for mg or epsom salts or whatever you have

Naa I wouldn't think so. I have suffered mag defficiency before and the symptoms generally entail yellowing of the outside of the leaves in a tiger stripe pattern along with rust spots throughout middle of leaves. Mag defficiency generally doesn't occur until flowering because that's when this element is most utilized by the plants. If you see furthering symptoms such as described above then I'd suggest mixing about a teaspoon of epsom salt per 1 gallon of water and water as usual with the solution for the next couple times until the symptoms begin to subside.

 

[sweetsmoker]

cheers stanky i think ive sussed prob now ( ph lockout) i gt ph 6 going in and ph 8 coming out a gd flush through shud sort them ok also think my plants have gt a little bug prob which i will sort out presently along wit a sterilise of the grwroom

 

[sweetsmoker]

ok so done all i can now flushed right through with ph 6 and have managed to gt run off dwn to neutral ph will lower my ph next few watering in attempt to lower some more, cleaned out room with zoflora and washed leaves with a pest killer, all i can do is sit back and wait im sure they will be fine if not shit happens eh!! only thing i need to watch now is any nute deficiendys occuring as i will have 2 wait at least 9 days before watering again and obviously there are no nute for her to feed jus water.

 

[DaveCoulier]

thnx dave, i have grwn wit rocwool several times and always experience trouble in veg but awesome in flowering, think this may be dwn to overwatering ? i am v careful with the watering, but it is always a posibility i havent given her water since transplant over 2 weeks ago apart frm about 250ml wit nutes as they looked like they needed a feed due to yellowing out. i wasnt aware that overwatering will make lower leaves yellow thought that was a def, but after reding the usefull thread reiss gave me i see it can contribute to the plants not being able to absorb the nitrogen.. one question though in flood and drain systems isnt the rockwool flooded twicw daily? how is it possible that it works if i can only flood once once every week and suffer frm overwatering... im sceptical that is the prob as also wen transplanting i minimally soaked the cbes as opossed to a thorough soaking . wat do uthink about the yellow new growth from the fimming i can post up 2 date pics if u like although i reckon its dwn to temp flutuation.

You'll also get brown necrotic spots on the same yellowing leaves when over-watering. If you've got them both together, its over-watering. You'll also definitely have more problems with over-watering in veg than flower, since the plants are smaller in veg and just can't use up all that excess water fast enough.

Ive never done flood n drain, but I thought they place the plants on top of rockwool slabs, so that part of the plants roots are above the flood level. The rockwool cube up top will soak up water through capillary action, but the upper parts of the plants roots should be able to breath without being water-sogged. Thats just my guess on that.

ok so i checked my run off and guess wat its around ph 8 my solution going in is ph6.2 so something fcked up there ,,,, also have spooteed some small black threads and dots under some of my leaves(minimal) i checked as there was some scar tissue on my leaves


i propose gd flush through with ph 5.5 water with half strength nutes bleach out growroom and clean out gd. while flushing spray the fck outta leaves with some leaf wash that i have smc us com premium quality leaf wash,,, its has alreday been used once as aprecursor
if u think im going wrong way about it please post as i will be doing this this evening thnx all or if u have any other advise please stop by and light 1 up

Did you pre-soak/treat your rockwool cubes before using them? They typically have lime on them from the production process. That'd explain the high ph run-off. Which definitely stunts plants too. Been there done that

Never had any bugs like you've got. Id be afraid to grow in a shack just for the reason you have now. Hope you get whatever it is taken care of.