Help! My seedlings are turning for worse! leaves yellowing and drying off

[mostwonted]

Dear friends,

Although i am new to this forum i have been lurking around for many months now, and i love it( lots of great info and great community)

This is my first grow and i am having major problems with my seedlings.

They have stopped growing or are growing very very slow. ( Leafs are turning yellow and edges browning drying off?)

I would like to give breaf overview of what i have done so far.

I propagated them on 22/12/13 its now 21/1/14. So 4 weeks old

The seeds where propagated in Canna Rhizotonic and Canna start in dome propagator. After the sprouted and first set of leafs showed up i transferred them in to DWC hydro(transferred on day 6 from propagation. With Canna start( EC 0.6) in rhizo(Ph5.8)

Since then after being transferred they started yellowing and its been a battle down hill since....

The carrent nutirents in the water are

Canna A+B EC=ranging from 1 to 1.2
Cannazym=20ml per 10L
Ph checked daily and is always between 5.2 and 5.8 (Ps i always aim for sweet spot 5.5!
Currently all ph is between 5.4 to 5.7
Grow room temp is always 24 and never goes up
I have 600W Big ass LED light which is currently set to VEG( only Blue specturum)
I have a little fan in the room to circulate the air

I probalby have missed out something..

Please help me out with this its stressing me out and i feel helpless Any help suggestions will be greatly appreciated

I have taken lots of pics please let me know what you think

Thank you all

 

[bucktoothal]

Re: HELP! My seedlings are turning for worse! leafs yellowing and drying off

Looks and sounds like you got Nutrient burn/mold issue. looks like your Ph. is o.k,room temp good. but what about the water temp?
I had this issue many years ago. mine was water.water was a little too cold. your Water temp. should be around 65- 70 F. for most. some like it a little cooler and some like it a little warmer. I have never used the nuts. you are using, but you should only use about 1/4 strength until they are about a month old

 

[mostwonted]

Re: HELP! My seedlings are turning for worse! leafs yellowing and drying off

Hi Bucjtoolthal, thank you for your quick reply.

I am a little puzzled as i started off with very low dosage EC (0.6) of nutrients and the problem persisted, then i slowly kept on adding more Aqua A+B to see if they will improve, but they didn't. All this was done in week 2 ! then week 3 i lowered the dosage of nutrients to 0.4EC. Finally week 4 i upped the EC to 0.8 and 4 days ago to EC 1.1
Hope that makes sense

Water Temp i try to keep to as low as possible, but it does creep up on me sometimes to 21c. Never below 19c.?
I must have messed up somewhere along the way. May Calcum deficiency ? or Copper deficiency?

Mold issue from what i understand is only on one of the plants and that is because the leafs where touching the wet pebbles. Unless there is mold on all of them? not that i can see?

 

[trichomes]

Re: HELP! My seedlings are turning for worse! leafs yellowing and drying off

I agree with buck, also, I can help but I need numbers that I don't have to convert to F,

do you see white roots coming out of rock wool? I doubt it, don't feed until cubes are dry and pots feel lighter than they are now.

Young plants should have to "search" for water, this is why they make roots, too much water and roots have no reason to reach for water.

 

[mostwonted]

Re: HELP! My seedlings are turning for worse! leafs yellowing and drying off

I agree with buck, also, I can help but I need numbers that I don't have to convert to F,

do you see white roots coming out of rock wool? I doubt it, don't feed until cubes are dry and pots feel lighter than they are now.

Young plants should have to "search" for water, this is why they make roots, too much water and roots have no reason to reach for water.

Thanks for replying and advice

I decided to start over as this babies are looking to gone

 

[KingJohnC]

Re: HELP! My seedlings are turning for worse! leafs yellowing and drying off

Your plants appear nutrient burned, I would reduce the amount of nutrients you are feeding.

here is a nutrient availability chart

here is a cannabis leaf deficiency chart

here is the Cannabis Plant and Pest Problem Solver and the Plant Abuse Chart

Cannabis Plant and Pest Problem Solver - Pictorial

Plant Abuse Chart