What is happening to my sprouting plants

  • Thread starter elektradw
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elektradw

elektradw

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I can't seem to get by the juvenile stage of growth. I have gone through 12 attempts and all have failed with the same symptoms. The fan leaves turn brown and die off. Is the soil too hot? Too much water? Too little water? Too much light/heat? I am using 8 50w fluorescent bulbs at 35000 luxx. Can anyone give me a clue by looking at the pics?
 
elektradw

elektradw

8
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is there no hope for recovery? I was being careful not to over water. I thought 35k lux was about right according to what Iv read.
 
Homesteader

Homesteader

What is the soil mix you are using? Do you have access to another? Were you using that mix for the others as well? Those mixes of wood chips box store stuff don't work very well for young plants.
 
Homesteader

Homesteader

Your problem is soil related. Lux is not a decent measure for grow lights because it is weighted on what the human eye sees. A light with more yellow than blue will have much higher lux even though the energy is the same. My lights with 660nm red barely show up on lux. She a pic of your light hitting the plant if you can
 
gorillaglueaaron

gorillaglueaaron

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Your problem is soil related. Lux is not a decent measure for grow lights because it is weighted on what the human eye sees. A light with more yellow than blue will have much higher lux even though the energy is the same. My lights with 660nm red barely show up on lux. She a pic of your light hitting the plant if you can
I forgot to paste the link mb.
Check again.
 
gorillaglueaaron

gorillaglueaaron

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This graph doesn't work because as stated above, lux is based off of the human eye. The plant sees different rations of light than humans. What you want to go off of is ppfd (photosynthetic photon flux density), the amount of light the plant sees. I'd say 200 ppfd max for early veg, 200-500 for veg and 500-1000 for flower. It is a different case if you have supplemental CO2 but to keep it simple go with that. Go to that link I posted and figure out the lux you need based on your light spectrum.
 
growsince79

growsince79

is there no hope for recovery? I was being careful not to over water. I thought 35k lux was about right according to what Iv read.
The cups are saturated and have water running down the sides- clearly overwaterd. Next time, weigh the saturated cup. Then let it lose at least 1/3 weight before watering again. My cups weigh 270g wet. I water when they get to 170. 15k lux cfl for seedlings.
 
Mr. Molecule

Mr. Molecule

It does sound like overwatering combined with too strong a light for early growth (which will shock them).

You're going to be much better off taking the lessons learned here in this thread and starting over. Cannabis is very sensitive to problems that occur in early stages, especially in the baby seedling stage as in this case. They very often will become stunted and never recover. I'm afraid that in trying to nurse this one in a protracted battle to try to bring it back, you may become jaded about growing. After 12 losses, you really need your next one to be a win.
 
GNick55

GNick55

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It does sound like overwatering combined with too strong a light for early growth (which will shock them).

You're going to be much better off taking the lessons learned here in this thread and starting over. Cannabis is very sensitive to problems that occur in early stages, especially in the baby seedling stage as in this case. They very often will become stunted and never recover. I'm afraid that in trying to nurse this one in a protracted battle to try to bring it back, you may become jaded about growing. After 12 losses, you really need your next one to be a win.
+1
 
elektradw

elektradw

8
3
The cups are saturated and have water running down the sides- clearly overwaterd. Next time, weigh the saturated cup. Then let it lose at least 1/3 weight before watering again. My cups weigh 270g wet. I water when they get to 170. 15k lux cfl for seedlings.
might look saturated but I only mist the plants from above. then cover with a clear class to contain the. humidity.
 
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