Auto seedling looking sick..Nutrient deficiency or light burn?

[BibbyMcBuds]

Hi all, hope everyone is well. Been a couple months since my last grow so I'm a bit rusty. I'm growing an Auto in coco perlite, run to waste, 200 watt spider farmer led at 70% power 61cm from plant which is what the manufacturer recommends. Feeding at pH: 5.9 PPM: 250 Temp: 20 degrees Celsius. Tent temp stays around 22 to 23 Celsius & humidity is a bit low between 50% to 65%. Strain is called "secret high cbd strain" & it does say its a moderately hard one to grow. I'm trying a new nutrient called cronk nutrients that is meant to be specifically for autoflowers, I've added calmag past 2 waterings to the base nutrient. I've gotten it to week 2 but now it's looking very light green with a brown spot on the tip of one of the leaves and the new growth has black bits on the tips, the leaves seem a bit limp too. It did stretch quite a bit at first so I burried the stem & lowered the light. I took pics with LEDs on, all lights off & with camera flash on so hopefully someone knows what's going on. I did google it but couldn't get any good answers to the problem, someone else did seem to have the same problem but didn't get any answer in the end. If anyone could help me out a bit that would be great, thanks very much in advance

 

[Nutty sKunK]

Is that 250ppm including your base water ppm?

Looks hungry! I don’t grow in coco but you need to add nutrients in every feed to the media and 250 doesn’t look enough!

Hopefully someone who knows coco will chime in

 

[Farmer's Hat]

Increase the Nitrogen dose a little bit. Other than that, the plant seems to be looking ok.

 

[7CardBud]

Made for specifically for autoflowers.

 

[Delps8]

Made for specifically for autoflowers.

I've heard a lot of myths about autos but nutes specifically for autos is a new one.

It's all the same 16 (or 18 ) chemicals. Some come in pretty bottles, some are in bags but it's all the same 16 (or 18 ) chemicals.

 

[bignugs68]

This really sucks to figure bc new growth is often lighter green anyways, but I noticed it's more your 2nd and 3rd node that are most affected. Just looking at this chart..sulphur deficiency looks the closest match.

Honestly shocked your having issues with it so young. I do t even feed nutes till the 3rd node bc I've been taught/read that a seed has enough nutes/energy to make it to 3rd node with just water.

 

[Nutty sKunK]

This really sucks to figure bc new growth is often lighter green anyways, but I noticed it's more your 2nd and 3rd node that are most affected. Just looking at this chart..sulphur deficiency looks the closest match.

Honestly shocked your having issues with it so young. I do t even feed nutes till the 3rd node bc I've been taught/read that a seed has enough nutes/energy to make it to 3rd node with just water.

He’s in coco which is inert. 3rd node on just water is growing in soil

 

[cat shit]

Have a look at coco for cannibas online , I learnt everything about growing with coco there and it's all really good info I use coco for autos sometimes but have been sticking with a peat based medium . That plant needs food have a look and you'll be able to come up with a nutrient regime. In coco I start at 0.3 ec as soon as the first set of leaves open and gradually build up to 1.0 ec by around week 3 and up from there. Good luck

 

[cat shit]

Have a look at coco for cannibas online , I learnt everything about growing with coco there and it's all really good info I use coco for autos sometimes but have been sticking with a peat based medium . That plant needs food have a look and you'll be able to come up with a nutrient regime. In coco I start at 0.3 ec as soon as the first set of leaves open and gradually build up to 1.0 ec by around week 3 and up from there. Good luck

The auto front right is in coco/ perlite , from sprout I make up a nute solution with 0.4 cal mag and 0.6 coco a and b then I dilute it down to seedling strength around 0.3 0.4 and then you increase your ec up to wherever the plant can handle it this one is 5 weeks and it's feeds are at 1.2 ec. Coccoforcannibas.com

 

[MickFoster]

Was your coco buffered?
Does the 250 ppm include tap water or do you use r/o?
How much nitrogen, phosphorous, and potassium do the nutes have? Never heard of a nute line specifically for autos.
Do you ever use plain water?
How often do you feed?
Do you feed to run off?