Need help with seedlings (dried up leafs and curling down)

[Philosophy]

These babies are about a week old. Under a 250HPS, allmix soil, Jorges Diamonds strain, Budbox tent, with 125RVK extraction and 3" fan inside the tent.

They were all growing strong until 2 days ago. One dropped leafs and started to have this weird leaf formation. Then another one started to look like that (not that severe though) and today a 3rd one follows.

I had them 12" from the HPS with the fan blowing on the lamp/reflector (to cool it). I have the idea that the hot air that bounced back on teh plants (from the reflector) really dried up the leafs of all seedlings. This morning they felt really dry. Like paper dry. So i moved the fan away and it blows towards a wet towel to raise the 33% humidity.

Temps run 24-27C lights on (RH 33%) and 21C lights off 55%RH.

Dont know if they re fan burned, lamp burned or the allmix is too hot for them.

Any feedback is appreciated!

peace

How long has this problem been going on? 4 days
What STRAIN are you growing? Jorges Diamonds
What was the establishing technique? (seed or clone?) Seed
What is the age of your plants? a week old
How Tall are the plants? 3"
What PHASE (seedling, vegetative or flower) are the plants in? Seedling
What Technique are you using? (SOG, SCROG etc) NA
What size pots are you using? (Include how many subjects to pot) 4"
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) Allmix Biobizz
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* No nutes at this point. Just Root juice about 4 years old (the bottle)

What is the TDS/EC/PPM of your nutrients used?
What is the pH of the "RUN-OFF"?
What method of pH test was administered? Using Strips? pH pen?
How often are you watering? every 2nd or 3rd day
When was your last feeding and how often are you feeding? no feeding
What size bulb are you using? 250HPS
What is the distance to the canopy? 12"
What is your RH Factor? (Relative Humidity) 33% lights on 55% lights off
What is the canopy temperature? 28C
What is the Day/Night Temp? (Include fluctuation range) 21-26
What is the current Air Flow? (cfm etc.) 225m3/hr
Is the fan blowing directly at plants? yes and no
Is the grow substrate constantly wet or moist? moist
Is your water HARD or SOFT? soft
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? bottled
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? no

 

[wygram]

don't use bottled water... it sometimes brings on more problems than it solves... tap water left out for 24 hrs...

 

[sirgrassalot]

Hot Soil for seedlings?

Hot Soil for seedlings?

Bio Bizz All-Mix Soil

It might be a little bit more expensive than soils you might find in garden centres but the results more than make up for it.
Top notch soil
Bio-Bizz All-Mix is unlike anything you would find in a garden centre. It contains an effective blend of soil (20%), compost (35%), worm castings (10%) and Perlite (30%) as well as a special 'pre-mix' (5%) of biologically active organic ingredients that have been fermented for a month to create a potent mixture.

 

[wygram]

i've used bb allmix in the past... excellent even for seedlings... to me it's the bottled water which is sometimes spiked with sodium for human consumption

 

[sirgrassalot]

i've used bb allmix in the past... excellent even for seedlings... to me it's the bottled water which is sometimes spiked with sodium for human consumption

Different seeds different reactions. Only tap water here too. Watch the heat from the lamps & any over watering.

 

[Philosophy]

hmmm...3/3 replies and everyone mentions bottled water. I ll keep that in mind.

From now on, tap water, left for 24hrs.



I thought the problem came from the hot soil (biobizz allmix). Certain strains dont take it very good (at seedling stage i m talkin about). But i wasnt gonna get a 50L light mix bag just for 4 x germ pots...

My first thought for this problem was overwatering, since the affected seedling didnt drink up like the other 3 and the soil was soaked for 2-3 days. Then my second guess was "hot air burned seedling" and then my mind even went to the point that the Root Juice might be out of date, since i ve had it for over 4 years outside (heat/cold etc).

I m used to watering carefully (not too much not too little), but a week ago (and after watching a Cervantes video) i started doing the soak the pot till it runs from the bottom and then let it stand in the water for 10mins theory. To be honest, IDK if this technique is really suitable for seedlings....

i think it drowns them

 

[wygram]

the root juice might go bad after such a long time... i had a bottle of algamic start smelling funky in less than a year...

I m used to watering carefully (not too much not too little), but a week ago (and after watching a Cervantes video) i started doing the soak the pot till it runs from the bottom and then let it stand in the water for 10mins theory. To be honest, IDK if this technique is really suitable for seedlings....

i think it drowns them

i think you're right on... that technique isn't good for any stage of plant growth, just bad advice... seedlings need just a bit of water... i like to water around the edges of the container so they have to go searching for the water...

 

[Philosophy]

The ill one continues to have minimum growth, but nevertheless its alive. Prolly it will take her a week to recover (if she recovers that is).

The other three are ok. Little stressed, but ok.

I think the problem became from 3 things. Bottled water, expired root juice and fan burn/hot air.

BUT: I m afraid that Jorges Diamonds (the strain) is a bit sensitive. Maybe a sign that it has blueberry in it.

Since know one know the exact pedigree of this strain, you cant have a basic idea of its tendencies, needs or sensitivities