Seedling Troubles: Part 2

[Cashish]

I have 6 seedlings growing with 4 being at least 5-6 weeks old, of those 4 only 1 seems to be semi-normal. The other 3, of the 5-6 weeks old seedlings, seem to be doing terrible. Of the 6 in total there are 2 younger seedlings mixed in with the older ones, maybe 3-4.5 weeks old, which seem to be doing good with a some minor leaf twisting on the margins and yellowing of lower leaves. I've been giving them some 1/2 strength 20-20-20 nutes with waterings. I water when the soil just passed the first joint of the finger is dry. My P.H. is slightly less than 7.0, like 6.85 or somethin like that. Before applying any ferts to the water i let it sit for 2-3 days to evaporate Cl. All 6 seedlings are under dual 5 foot fluoros, suited for plant and aquarium use. The plants are anywhere from 1-2 inches away from the lights. Light cycle is set to 12/6 light to dark hours.

Here is my soil i've been using, mixed with 1/3 perlite:
the bag is 25L (1 cubic foot)
Brand: Premier Pro-Mix: Ultimate Organic Mix (.35-.5-.3)
Components (as read on bag): Canadian Sphagnum Peat Moss (65-75% by volume), Sea Based Compost (from composted shrimp shells and seaweed), Limestone (for pH adjustment), Biological Growth Enchancer (Endomycorrhizae), Perlite.

The soil company gives a guaranteed Analysis:
Total Nirtogen (N)..........................0.35%
0.14% water insoluable nitrogen
0.15% Nirtrate Nitrogen
.006% Ammoniacal Nitrogen
Available Phospate (P205)...............0.05%
Soluable Potash (K2O)....................0.30%

Non-plant food ingredients:
Type: Endomycorrhizae Fungi
Species: Glomus Intraradices

the bag also says the above numbers are derived from the composted shrimp shells & seaweed, Sphagnum peat humus and limestone.

Hopefully, with the pictures available, someone will be able to diagnose and save my plants

P.S.: this is my first grow.

 

[Cashish]

Here are the pictures of my sick plants. This plant is 5-6 weeks old, semi-normal looking.

 

[SHAMAN]

Loose the 20.20.20 your soil already has nutes in it.
You are over feeding I think....

 

[Cashish]

Heres another 5-6 week old plant, which looks too tall, has purple stems and dead spots on it's mid leaves.

 

[Cashish]

next 2 pics are 5-6 weeks.

 

[Cashish]

these are pics of younger (3-4.5 weeks old), better off plants. Why are the leaves curling under and the bottom leaves yellowish?
P.S. the crooked stem must be genetic cause it was like that from the beggining it seems.

 

[Cashish]

Loose the 20.20.20 your soil already has nutes in it.
You are over feeding I think....

i guess i shoul've added that the problems started pre-nutes.

 

[SHAMAN]

Are these growing in a window? they look kinda stringy. What kind of light?

 

[babygro]

IHopefully, with the pictures available, someone will be able to diagnose and save my plants

Hiya Cashish

I've given this problem quite a lot of thought and I think there might be multiple things going here but without a little more information it's difficult to narrow them down. What kind of ventilation are you using? Are you giving them plenty of air changes? Also what is the wattage and colour temperature of your lights?

Okay, I think your soil is a very fascinating mix of ingredients the like of which I've never come across before! However, its sounds fine, the only thing that concerns me is that your soil contains perlite already yet you mixed it with a 1/3 perlite? That's too much perlite really - should have made your soil drain nicely though! So the extra perlite has removed some of the soil nutrients and those plants if they've been in those pots for that long must be coming up for a repot now surely?

So you've got some Magnesium deficiency on at least one which you can treat with a foliar spray of 2% solution of Epsom salts to water, but I suspect your nutrient strengths are a little high in your fertiliser.

So, I'd repot them all into fresh pots and fresh soil, learn how to water them correctly with the 'wet/dry' 'weight of the pot' method and look around for some nutrients with NPK formulation closer to what Marijuna prefers.

 

[Cashish]

What kind of ventilation are you using? Are you giving them plenty of air changes? Also what is the wattage and colour temperature of your lights?

Im growing in my closet. During the day time i leave my closet door open all day long, the only time i close it is when i go to bed. The only ventilation i have i the open door; i open my bedroom window on warm days so my birds and plants get some fresh air. Both of the fluoros im using are 40 watt - I tried checking the manufacturers website for color temperature but they don't have that info .
thanks for the replies yall, i need all the help i can get

 

[B-kush-420]

id loose the 20-20-20 and try some 10-52-10 or something around there and maybe a little more peatmoss to your soil to help it hold on to the nutes better i also have had good results with fish emusions.... maybe a consideration but the look god
good luck man

 

[gardenandcats]

id loose the 20-20-20 and try some 10-52-10 or something around there and maybe a little more peatmoss to your soil to help it hold on to the nutes better i also have had good results with fish emusions.... maybe a consideration but the look god
good luck man

You don't need 10-52-10! Your in the veg stage and thats way to high for veg 52.