Yellowing leaves on seedlings

[sirgrassalot]

I've heard that superthrive stuff was pretty heavy. Thiamine is probably their ingredient that does the work. I don't use the magic stuff. I don't spray with B1 but it's been done, just the vitamin. Mine tend to stay more on the healthy side & if you do that it's not needed. A spray once a day with water & B1 is fine for troubled seedlings.


Thiamine (Vitamin B1):
"B1 is produced in the foliage of plants and transported down to the root system where it has an effect on root growth and development. In tissue culture and rooting preparations, B1 helps to stimulate the growth of roots on new plants but this is best used in combination with rooting hormones. B1 can assist at any time in a plant's life with root regeneration where the root system has been damaged or stressed through high salinity, pathogens suchas pythium, nutrient deficiencies and toxicities, high fruit loading etc but only if the foliage of the plant is unable to produce sufficient supplies for this purpose. Use of B1 is seen as a 'back up' or 'insurance policy' as it is difficult to determine if a plant which has come under stress is capable of producing sufficient B1 to send down to the root system to assist in cell development. Use of Vitamin B1 in plants is the same as in humans - it is most useful where a deficiency exists for some reason. B1 is best applied as a seed soak to speed up germination (root growth), or as a foliar spray.

B1 is an organic compound and as such is rapidly broken down by microbes in the nutrient solution (they love to eat carbon based compounds), adding high amounts of B1 may ensure sufficient thiamine stays in the nutrient for a few hours for some plant uptake, but generally microbes will break this down rapidly as well. FHD "
http://www.quickgrowsouth.com/gardening_articles/plant_hormones.html

 

[PrideofCucamong]

stitch, how many times a day should i spray them?

btw, my largest plant is starting to yellow.

 

[sirgrassalot]

He has not fed them yet.

The only time you need to feed them foliar is until the soil drys out enough to where you can water them with nutrients, but it needs to be the same amount as you would foliar feed them.

PrideofCucamong
Feed them once with a very mild dosage. Whether you spray it or add it to the watering.

 

[PrideofCucamong]

I sprayed them all once i used a 1/4 teaspoon of PBP in a gallon of water, it seems very dilute.

 

[sirgrassalot]

They need very little.
You can wait & observe them for
a couple days to check progress.

 

[MynameStitch]

I would go ahead and spray them once every day or every other day for about 2 days in a row...... then stop until you can water them normally. Once you feed them in the soil when you water you won't need to foliar spray anymore.

you can try 1/2 teaspoon, but I would wait a bit to see if this feeding has made a difference, takes around 2 or more days before showing something

 

[AugustWest]

hey pride.. what kind of soil are you using?
are you growing in a hydrohut by chance?

good luck man..

 

[Navigator330]

Pride: Definately listen up about the Superthrive.... I dropped a bomb on my plants by using it just once. Then Stitch told me about how bad it is in large amounts and i realized the trouble. Between that and my over nitro problem my plants are tiny compared to what they should be!

 

[HeadyPete]

Don't get too dependent on foliar. The raised humidity can lead to bud rot or powdery mildew down the way. It's good for quick fix like Stitch said, but feeding through soil is ideal.

 

[strain_searcher]

Plants should not need a feeding for first 3 weeks in seedling soil. I never understood why people torture seedlings after they over watered them. 99% of the time seedlings are either getting too much or not enough water. Now you know to use cups. Your seedlings should recover fine. Feeding them only puts more stress on them right now.

 

[PrideofCucamong]

ok cool, i am growing in pro mix seedling starter

 

[HeadyPete]

Killing them with love....

 

[PrideofCucamong]

Update

Update

i think you might be right headypete.

I have a little update, not sure about these girls, not looking to good. I really dont know how i screwed them up so bad. I have grown 5 times before and never had these problems, but it was bagseed. Ive got some new ones started now.

I sprayed them all with a mix of pure blend pro mixed in the water (1/4 teaspoon per gallon) looks like there getting worse. I started this about 4 days ago.

this is my skunk 1, now really showing the yellowing. WTF!



heres my skunk1 x big bud




my other plants are pretty much screwed and havent been doing much of anything in the last week.

 

[PrideofCucamong]

I am starting to think that the yellowing could be from the soil drying out. Since they are in such large pots i feel like the sides and bottom are drying out much faster than the rest of the soil. The roots could be growing into this wet soil, and then it drys out and they are left with nothing (and die off.) This room i am using is so damn dry too, and the radiators do not help. What do you guys think about submerging the bottom of the pots in water? I could also add a little bit of water up top too. I am really worried that the bottom and sides of my pots are bone dry.

Thanks for the help, you people are great

 

[MynameStitch]

I am starting to think that the yellowing could be from the soil drying out.

They look more like they are being kept too wet than dry, your plants would have a more droopy look to them if they were underwatered, but they are not, they are being kept too moist, if I were you, to save them I would remove them from the mixture and put them into cups if the method you chose is not working well, they may not even grow anymore and may have already been stunted and if that is the case nothing you could ever do for them will make them grow again.

 

[sirgrassalot]

A mist a day let them dry almost completely. Hang in there.

 

[PrideofCucamong]

In the picture above they look wet because I misted the top of the soil before the picture. The soil on the bottom of the pots seems to be bone dry.

 

[sirgrassalot]

Is the pot Feather light? Pro-mix is amazingly light when completely dry. You have sprayed enough water for them. Mist <<<mist once a day until the pot is featherlight. Than a water not soaking.

 

[MynameStitch]

You don;t need to mist seedlings, it's a waste and will cause them to slow there growth, clones yes, but seedlings no.
If you are foliar feeding, that is different