Help, plants dying for no reason

[Socrates]

So, they were doing fine, and then all of a sudden...



Not over or under watered, as far as I can tell. They got droopy and then dry and crispy like this. Very sudden. I am heartbroken. What do you think could have happened, so I can save the rest (below)? They have also all been very slow to veg.




Thanks.

 

[Guest]

maybe severe nute burn or a bad case of root rot.
how hot does your grow chamber get and how hot does the soil get? small containers in a hot room usually leads to cooked roots.

 

[Socrates]

I doubt it's nute burn, I've just given them a little occasional bit of 1-0-0 fish emulsion, but in like half-doses. Its possible that they could have gotten cooked but the AC usually keeps the temps fairly reasonable...I'll keep them down more and hope that was the problem. Any other ideas?

 

[Mr.M]

What about soil Ph? What type of soil mix are you using? Is it possible your soil was too rich for seedlings?
Peace, Mr.M

 

[b8man]

That's nitrogen def isn't it (where the older leaves go pale, yellow and die)? In which case more fish emulsion (that's a very weak fish emulsion by the way) each day should clear it up. It's hard to tell from those pictures. If the yellowing starts from the edges of the leaves then it's burn and you need to flush with (pref p.h. adjusted) water.

Worth checking soil and water p.h. - amazing the amount of problems caused by wrong p.h.

B8

 

[Guest]

How old were they when you started giving them nutes? You really don't need to give young plants any nutes until they ask for it. Another question is how often have you been feeding them? If your medium has alot of buffering capability it might have been holding nutes until it reached a critical overload especially if you've been fertilizing frequently. It certainly wouldn't hurt to check your ph, usually with plants that small ph shouldn't be an issue unless it's way out of whack but if they have been chronically overfertilized there could be a build up of nutriant salts. As far as watering goes, don't give them a drink until they need one, lift the container and if it's light give them a real good drink. Overwatering isn't caused by the amount of water given but from the frequency of watering.