spots forming on seedlings

S

SkunkyCookies

Member
whats going on here. They looked hungry so I fed them last night. I used advanced nutrients sensi grow a and b with b52 and voodoo. All at half strength. Ph was about 6.8. I'm in vermnipro soilless medium. Did I ph it wrong or soemthing?
 

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SkunkyCookies said:
Isn't that a bit unusual for seedlings this young? Thought I would be told it's a ph problem
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it does look like a cal mag problem imo..
and it looks like you're growing in hempy? you've got to remember that perlite contains absolutely no nutrients, everything is going to have to be provided by you, and the problem, cal / meg def. gets worse if you're using r/o or bottled water...
 
here's a pix of a cal / mag. deficiency i pulled off of google images.. it looks a lot like what you've got going on, just in a little bit later stage imo..

th
 
That white stuff is gnat nix by grow stone. Just a top dressing. There's a lot of gnats in my house sense I recently moved back in. I have some sensi cal mag xtra by advance nutrients. Will that do the trick? Half strength or full strength? What shud my ph be for a soilless medium.
 
racerboy71 said:
it does look like a cal mag problem imo..
and it looks like you're growing in hempy? you've got to remember that perlite contains absolutely no nutrients, everything is going to have to be provided by you, and the problem, cal / meg def. gets worse if you're using r/o or bottled water...
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I used tap water. Could not make it to the store for distilled.
 
SkunkyCookies said:
That white stuff is gnat nix by grow stone. Just a top dressing. There's a lot of gnats in my house sense I recently moved back in. I have some sensi cal mag xtra by advance nutrients. Will that do the trick? Half strength or full strength? What shud my ph be for a soilless medium.
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yeah, that should be fine, the cal/ mag you have.. i'd probably hit it, shit, they're pretty small still, half strength at first, and see how they respond.. i think the cal / mag i use is only a small dose so yeah, go half and see how they do..
ph in soilless should be some where around 5.5 up to about 6.2 on the high side of things according to what i just googled since i'm a dirt bag, lol..
 
racerboy71 said:
yeah, that should be fine, the cal/ mag you have.. i'd probably hit it, shit, they're pretty small still, half strength at first, and see how they respond.. i think the cal / mag i use is only a small dose so yeah, go half and see how they do..
ph in soilless should be some where around 5.5 up to about 6.2 on the high side of things according to what i just googled since i'm a dirt bag, lol..
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Well that might be a factor here. I fed it at 6.8 almost 7 thinking I was in soil :( haha then I remembered soilless is like running hydro. I have so much going on. Just moved back in off the street and setting up a glassblowing studio
 
SkunkyCookies said:
How do I fix my ph? Feed it again with the correct ph? With or without food? Idk maybe it's perlite being sold as something else. But it's a top dressing
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yeah, just feed water with the correct ph.. i'd still feed them, but just make sure you ph, always ph after you add the nutes as the nutes will change the ph of the water, and if you do it before you add them, you're only going to have to adjust it a second time..
 
racerboy71 said:
no problem, keep us updated on how you make out m8
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Will do! I'm not back to my girls until Friday but I'll be sure to up the cal/mag a bit and report back. I've read here that plants under COB leds tend to be cal/mag needy.
 
racerboy71 said:
yeah, just feed water with the correct ph.. i'd still feed them, but just make sure you ph, always ph after you add the nutes as the nutes will change the ph of the water, and if you do it before you add them, you're only going to have to adjust it a second time..
Click to expand...
Thanks I just did it a couple hrs ago. Wanted to do it last night but didn't happen.
 

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