Stunted Seedling - Planted in Dry Soil

[tronN00dles]

Hey folks,

So my first attempt at growing a Northern Lights Auto came to a halt after 22 days when I destroyed the main stalk trying to do some LST. Long story short, I started over. I'm currently on Day 8, and I must say, this seedling doesn't look near as nice as the previous one did at the same age. Here she is:

By Day 9 of my last go around, the plant was a beautiful green and had 4 large leaves. This thing hasn't grown at all since Day 5, and you can see those little yellow spots in the center.

Here's an overview of what I'm doing now vs. what I was doing previously.

-The soil was pretty much dry this time around, and I've been watering a tablespoon or two of water a day, plus misting with a spray bottle. Last time around, the soil was moist when I put the germinated seed in.
-Light is on 24/7; it was 20/4 last time
-same 20,000 lux of LED light
-temps have been slightly lower, around 22C; closer to 25C last time
-humidity stable at 65%
-I was a little rougher with the seed/taproot this time around

So basically, the big differences are this:
1.) Germinated seed was handled a little rougher
2.) Soil was dryer overall
3.) Temps a little lower

Will this seedling eventually recover? Is there anything I can do to help it along?

***EDIT***

Here it is now on Day 10 (left), compared to my last grow at Day 10 (right). Both Northern Lights Auto. Main difference in seed being planted into dry vs. moist soil, respectively.

Should I start anew?

Thanks

tronN00dles

 

[Jimmythenugg]

I've done 8 NL autos, only two grew to yield and they complained all the way through, smoke was ok at best.
am never going to drop an NL bean again (RQS genetics anyway)
However i'm no expert so hang about for alternate opinions, but might suggest following:

Lux (although not the best measurement) needs to be a quarter of that to get them running for first few weeks (min sit under a 50w led perhaps 4k max lux)

Would stick to the 20/4, to never have time off is a shit gig those last few hours of rest will do wonders.

Also would make a little more water available (esp in your medium)

Temp n RH appear good,
Good luck Tron's

 

[tronN00dles]

I've done 8 NL autos, only two grew to yield and they complained all the way through, smoke was ok at best.
am never going to drop an NL bean again (RQS genetics anyway)
However i'm no expert so hang about for alternate opinions, but might suggest following:

Lux (although not the best measurement) needs to be a quarter of that to get them running for first few weeks (min sit under a 50w led perhaps 4k max lux)

Would stick to the 20/4, to never have time off is a shit gig those last few hours of rest will do wonders.

Also would make a little more water available (esp in your medium)

Temp n RH appear good,
Good luck Tron's

Thanks! Although I think one of us is confusing lux with lumens. My understanding is lumens represents the color spectrum, i.e., typically in the range of 3k-5k. Lux would be light intensity. I've read 20,000 for seedlings, 40,000 for veg and 60,000 for flower.

As for the light schedule, I was having trouble keeping the temps up on my last go around during the dark period, hence me trying the 24/7.

As for the seeds, they're from CKS. If this fails, hopefully third time is the charm! LOL.

-tronN00dles

 

[tronN00dles]

One thing on my mind... for the past few days while I have been spraying the soil, I have been getting a bit of spray onto the leaves. Could the water on the leaves be 'burning' into the leaves under the 24/0 light?

 

[Jimmythenugg]

Thanks! Although I think one of us is confusing lux with lumens. My understanding is lumens represents the color spectrum, i.e., typically in the range of 3k-5k. Lux would be light intensity. I've read 20,000 for seedlings, 40,000 for veg and 60,000 for flower.

As for the light schedule, I was having trouble keeping the temps up on my last go around during the dark period, hence me trying the 24/7.

As for the seeds, they're from CKS. If this fails, hopefully third time is the charm! LOL.

-tronN00dles

A little confused, yes i always think of it as
Lumins is the total light emitted (Luminous flux): at source: so this is the light output

Lux is what visual brightness measured in a single point, (e.g. plant surface) - and its a shit way to go since most use cellphone or tablet sensors to read it.

I go
1500 - 5000 lux is the total amount of light for seedlings upto 2 weeksish (for me!) once the heavier feeding schedule kicks in I position lights to get 5/10 k extra a week until about 40k then in flower i rise to about 60/70 k (depends on plant what they will take without bleaching or foxtailing).

When you mention the colour spectrum, I think you mean the colour render index (CRI)?!
So warm light is typically at 3/3.5-k (this is only how 'we human's' perceive it. while the spectrum you talk of is possible the wavelength supplied (usually about 380 (blues) through to 780 (reds).
If I done goofed, am sure i'll be picked up by fellow members but sure i'm on the money here.
I will say I don't think your lights are damaging so its kind of incidental,

The spray might burn if it has nutes in it but doesn't look like nute burn to me...




you could switch your light schedule so the 'off time' is when your ambient heat is at its highest , this will alleviate sudden temp swings & peaks and will allow for a little more control when you need it.

 

[tronN00dles]

A little confused, yes i always think of it as
Lumins is the total light emitted (Luminous flux): at source: so this is the light output

Lux is what visual brightness measured in a single point, (e.g. plant surface) - and its a shit way to go since most use cellphone or tablet sensors to read it.

I go
1500 - 5000 lux is the total amount of light for seedlings upto 2 weeksish (for me!) once the heavier feeding schedule kicks in I position lights to get 5/10 k extra a week until about 40k then in flower i rise to about 60/70 k (depends on plant what they will take without bleaching or foxtailing).

When you mention the colour spectrum, I think you mean the colour render index (CRI)?!
So warm light is typically at 3/3.5-k (this is only how 'we human's' perceive it. while the spectrum you talk of is possible the wavelength supplied (usually about 380 (blues) through to 780 (reds).
If I done goofed, am sure i'll be picked up by fellow members but sure i'm on the money here.
I will say I don't think your lights are damaging so its kind of incidental,

The spray might burn if it has nutes in it but doesn't look like nute burn to me...




you could switch your light schedule so the 'off time' is when your ambient heat is at its highest , this will alleviate sudden temp swings & peaks and will allow for a little more control when you need it.

Awesome thanks!

I'll try turning down my light a bit and give her some dark time too!

Cheers,

Tony

 

[tronN00dles]

Here's an update:

I'm a little optimistic she will recover. The seedling is looking a little healthier and a little green. I think my big issue here is that it was simply underwatered. Here's my line of thought:

1. Yellowing is often associated with nutrient deficiencies
2. I'm using FoxFarm Happy Frog soil, which has plenty of nutrients
3. Seedling's don't need much water
4. BUT the water will facilitate the uptake of the nutrients
5. I put the germinated seed into essentially dry soil and have been simply misting the top of the soil
6. Conclusion: seedling couldn't get at any nutrients in the soil

Does this make sense? Anyway, I poured 60mL of water in a circular inch around the base of the stem and gave her a little rest. Boom, she's looking much better. I repeated the process this morning and I can actually see the yellowing starting to fade away.

Cheers,

Tony

 

[tronN00dles]

Day 10 Update - added pics in top post. Still not great.