Month old seedlings with only two sets of leaves!

[sophanox]

Hey guys,

I've got three jack herer seedlings here that are a month old. I misread some instructions and so overwatered them, and then nuteburned them. So they're growth was stunted for a week or two.

For a week then they grew well, but this past week they have stopped growing, and their leaves are changed from that lush green colour to a pale green, and the tips of the leaves are yellowing on two of them.

Here are the pics:




The plants are in a bubbleponics system. Res temp is mid 70s, air temps are high 70s low 80s. They are vegging underneath a 125W blue cfl in an air cooled hood which is about 5 inches above them. Humidity is between 50-70%.

As all the other conditions are within the acceptable ranges, I gave the plants a weak feed (75ppm) last night to see if this helps at all. Nothing has changed yet.

By way of comparison, here is a pic of the above middle one from last week - no conditions have changed since then.



Any help would be greatly appreciated! Thanks a lot!

 

[anhedonia]

mine are way mor light green than yours. I really hope they pull through but I'll have to germinate 5 more seeds.

 

[ijustgrowGREEN]

check out roseman's bubbleponics thread. he'll set you on the right path.... good luck

 

[sophanox]

thanks ijustgrowgreen but I've been hanging around that thread for a couple of months now and I've never come across anything like my case in there

 

[ijustgrowGREEN]

you asked and nobody there could help you?!?

 

[sophanox]

bump, yes of course i asked there but go no reponse, i dont think it's my actual system as it's pretty simple and i followed roseman's instructions to a tee.

 

[satch]

Take a gander at your root system. I've had plenty of Sativa heavy seedlings stop for a while and focus on root growth. Also are you vegging in 18/6 or 24/0? I had a tiny kid recently doing this and it got much better when I switched from 18/6 to 24/0 for a little while.

 

[sophanox]

Take a gander at your root system. I've had plenty of Sativa heavy seedlings stop for a while and focus on root growth. Also are you vegging in 18/6 or 24/0? I had a tiny kid recently doing this and it got much better when I switched from 18/6 to 24/0 for a little while.

Thanks very much for your response but unfortunately I can't look at the root system, the roots still haven't popped out the bottom of the netcups.

I have never heard that switching to 24/0 made a seedling grow better, I will research it and consider it.

Any other opinions? Cheers

 

[sophanox]

Checked out switchin the lights to 24/0, but i think the shock of doing so will be a bit much for these seedlings.

Here are some updated pics (three days on) - you can clearly see the whiteness is spreading, though only on two of the seedlings, one is fine, but not growing =(




Gonna move the light further back, just in case it's bleaching the seedlings (it was about 6 inches away, but in an air cooled hood so this seems unlikely). Gonna change the rez too see if that has any effect.

Any help would be greatly appreciated!

 

[KaleoXxX]

i have never seen a month old plant so small. it must be root bound and stunted as shit...

ever think of just putting some seeds in 3 gal pots of soil and see how long it takes to surpass this tiny little month old seedling?

 

[sophanox]

i have never seen a month old plant so small. it must be root bound and stunted as shit...

ever think of just putting some seeds in 3 gal pots of soil and see how long it takes to surpass this tiny little month old seedling?

can plants be rootbound in a rockwool cube with hydroton?

yes i used to use soil so i'm perfectly aware of how bad the situation is!

 

[KaleoXxX]

well im hydro illiterate, but id imagine the roots should have poked out of the cube and be dangling into the res by now. maybe the wool is too dense or something. if the roots havent emerged yet, id classify it as root bound

 

[Mysticlown150]

This happened to me when I first started growing. It was because of scotts soil had stunted root growth. I transplanted them and they are now in jars still curing to this day.

 

[purpdaddy]

They are stunted..give em just plain RO water.no ppm. Sunt usually takes 2 weeks after you got it right.

 

[sophanox]

Just checked the roots of the biggest one, they are nice and white and have grown about half an inch out the bottom of the rockwool cube

I dont understand how they were stunted for the first two weeks due to over watering and overnuteing, then were fine for a week and now are deteriorating again!

What a nightmare this had turned out to be - thanks for all replies

 

[KaleoXxX]

i would hold off on nutes, because they are old yes, but not big or strong enough for nutes

 

[purpdaddy]

Yea man i totally agree with kaleo..they still small yet old but STUNTED.SO i would give em just plain RO water..keep the humidity up if your temps arent too high and give em time

 

[Melangwanja]

I'm fairly suprised to see such small month-old seedlings. Unless I'm insane, mine are approx. the same age, in soil, and they've grown to at least 6 inches tall (without stretching).

Meh, anyways, I agree with Kaleo, don't nute it quite yet. Wait for it to grow to at least 3-4 inches tall before starting to nute, otherwise, your plant will only burn itself out.

If you're much of a risk taker as I am, you could, though, nute it to an 1/8 of how much you'd normally do it, and simply increase the dose gradually. Although not many recommend it, I,ve done that with my seedlings, and I obviously was very carefull to see if there were any start or sign of any burn. All that happened was that my plants grew a little faster than I'd anticipated, and with my lights that were oh so very easily adjustable (see the sarcasm), they burned themselves and had a little bit of a heat-stroke. Otherwise, doin' great now.

Now, I've got no idea why I just wrote all o' that down, but hey, I guess you might've taken the point I was unwittingly trying to get around.

I shut up now.

 

[sophanox]

thanks for all the responses, much appreciated!

will this stunting now affect their growth later on?

thanks very much!

 

[Melangwanja]

It's possible they won't be quite as tall as they should normally be, but depending on when you decide to have them flower, it is possible it won't really have any difference in the end.