New here - Discoloration of seedlings ( Autos) - cause for concern?

[digidemi]

Pictures of the roots? What's your humidity now?

Humidity between 65-70% fairly steady

 

[digidemi]

root system looks healthy to me?

 

[digidemi]

From what I'm seeing after doing more research, it def looks spot on ( no pun intended ) for a Cal / Mag deficiency.

 

[scyncegrown]

Yeah looks like Cal in that picture and if you have your humidity up you’re on the right track. Those blue/purple lights can push those deficiencies for sure. Just watch how much nitrogen is in your cal/mag mix you can over N really quick.

 

[Aqua Man]

I don't recommend cal mag with those nutes but it's up to you. They are designed to be used in RO and have the proper cal mag for this. If your getting deficiencies it's cause by something other than ph or calmag.

Are you adding anything other than the AN ph perfect? It can and in most cases will mess up these nutrients

You can drop humidity to a out 60% now looking at the plant size she is not a baby (seedling) anymore and I would classify as vegatative.

What are the air and water temps?

You can up the ppm to 300-400. Things change fast when they are young.

 

[Beachwalker]

I see this often with AN products. I recommend you switch nutes

 

[digidemi]

Here is my hypothesis, AN does claim to have all the secondary nutes, however I believe my problem is that I'm running autoflowers, and probably 1/4 nutes, however I'm pretty sure autoflowers still require normal calcium / Magnesium levels, which is probably where I'm running into a deficiency. I added some Advanced Nutrients Cal/Mag at 1/3rd dose to try to fight the deficiency and will keep an eye on ph over the next few days, I'll correct PH if needed and next time around I'll prob opt for dif nutes for autoflower strains.

 

[Aqua Man]

Here is my hypothesis, AN does claim to have all the secondary nutes, however I believe my problem is that I'm running autoflowers, and probably 1/4 nutes, however I'm pretty sure autoflowers still require normal calcium / Magnesium levels, which is probably where I'm running into a deficiency. I added some Advanced Nutrients Cal/Mag at 1/3rd dose to try to fight the deficiency and will keep an eye on ph over the next few days, I'll correct PH if needed and next time around I'll prob opt for dif nutes for autoflower strains.

For the record adding it will likely make things worse.

an increase in ppm and lower humidity and raise temps is what I feel will fix it. Calcium is passively uptake and that's directly related to transpiration rates. While your parameters were good for seedlings they pass this stage fast like 1-2weeks absolute tops and the humidity needs to be lowered and ppm increased to accomodate the need for more nutrients. Yes it's a deficiency but it's not from lack of cal or mag... It's lack of uptake.

 

[digidemi]

My PPM was 300 in this recent water change ( distilled + nutes ) temps around 79-81 in tent and I'd assume my solution temps are around 74-75 ( I put my air pumps outside of tent in 73F temps to keep water temp lower than ambient in tent. I dropped humidistat on the humidifier I got. so I'll try to hold 60%.

 

[Aqua Man]

My PPM was 300 in this recent water change ( distilled + nutes ) temps around 79-81 in tent and I'd assume my solution temps are around 74-75 ( I put my air pumps outside of tent in 73F temps to keep water temp lower than ambient in tent. I dropped humidistat on the humidifier I got. so I'll try to hold 60%.

It can take up to week to see results from a change in nutrients. Can even go 400 I bet

 

[digidemi]

I'll get there, next water change will be going full 1/2 strength, I'm at 1/4 str i believe right now. I'll prob leave cal/mag out next change since AN nutes will be twice the strength as this week

 

[digidemi]

I'm not doing wrong by beginning LST already eh? I noticed she had several nodes and a beefy stalk already so I bent stalk lightly back and forth a few times, secured base, and pulled the top over and 1 branch that had a big leaf blocking the new undergrowth.

 

[Aqua Man]

I'm not doing wrong by beginning LST already eh? I noticed she had several nodes and a beefy stalk already so I bent stalk lightly back and forth a few times, secured base, and pulled the top over and 1 branch that had a big leaf blocking the new undergrowth.

No lst is fine your good on that bro

 

[digidemi]

So I trimmed off the damaged half of leaves, and already within 24 hrs the plant seems much much happier, had a rapid burst of growth since cal/mag / removal of damaged leaves. Humidity steady at 60%

 

[digidemi]

No lst is fine your good on that bro

Looking alot better eh! Just bumped her up to 500ppm / Half Strength nutes, will see how she goes and add cal/mag again if I see additional brown spotting

 

[Aqua Man]

Looking alot better eh! Just bumped her up to 500ppm / Half Strength nutes, will see how she goes and add cal/mag again if I see additional brown spotting

Looking much better man. IMO don't add the cal mag. I think the issue was just to weak of nutrient solution. You shouldn't see this issue again now that the ppm is up... I would hold at 400-500ppm it will probably be a good range for you for a while yet.

 

[digidemi]

Yea, holding at 500ish PPM for 1-2 more weeks then adding big bud and possibly some carbs. then overdrive to keep her alive an extra week or so before flush

 

[digidemi]

Looking much better man. IMO don't add the cal mag. I think the issue was just to weak of nutrient solution. You shouldn't see this issue again now that the ppm is up... I would hold at 400-500ppm it will probably be a good range for you for a while yet.

So was and still is def calcium or magnesium deficiency. 1 day after I did that fresh water change and nutes at 1/2 str this time ( 520ppm and no cal/mag ) the brown "rusting" was all over the older leaves and starting to show up on some newer growth. I'm 100% certain I dropped a half dose of cal/mag, and again she perked right up, huge growth.

 

[Aqua Man]

So was and still is def calcium or magnesium deficiency. 1 day after I did that fresh water change and nutes at 1/2 str this time ( 520ppm and no cal/mag ) the brown "rusting" was all over the older leaves and starting to show up on some newer growth. I'm 100% certain I dropped a half dose of cal/mag, and again she perked right up, huge growth.

Don't think thats a cal mag issue... are those leaf tips resting on the bucket can you get a side pic? Looking at the old and new pics it looks like old damage that will continue to get worse

 

[digidemi]

Yea I just mean it was twice as pronounced yesterday, added cal-mag, and most of it went away and a nice growth spurt, plant is more perky than droopy. It's either a cal/mag deficiency, or the PH increase closer to 6 from cal mag fixed whatever the issue was. I did notice these nutes are pretty acidic. took my PH down to 5.4 or 5.5.