First timer help!!! Can’t tell if it’s a deficiency or burn!

_EQ · Nov 6, 2020

Hey y’all noob first timer here. I’m getting these weird spots and discolorations and blackish/purple spots one my edges and towards the center of my leaves. Can someone with more experience help me diagnose the problem?

Temps: 80/83F 47%Rh Day/ 60-65F 55%Rh Night
Lighting: 18/6
Nutrients 5g Megacrop plant food/2g Sweet Candy by Megacrop per 1Gallon of tap water
PH: 5.8-5.9

Johiem · Nov 6, 2020

There is a dude on here that has 2 charts that I've never found to be wrong. @Hobbes, think you could help? I would lean toward a calcium, and potentially magnesium deficiency. In the first stages of a deficiency of its not already in the recipe, that is my first step every time.

_EQ · Nov 7, 2020

Johiem said:
There is a dude on here that has 2 charts that I've never found to be wrong. @Hobbes, think you could help? I would lean toward a calcium, and potentially magnesium deficiency. In the first stages of a deficiency of its not already in the recipe, that is my first step every time.

Appreciate the response the more research I do the more the symptoms seem to match up with a cal mag deficiency. I’m coming off of a 3 day flush from nute burn. So it makes sense I want to make sure it’s not a nute lock out also. Will do a soil test tmrw morning.

HydroKid239 · Nov 7, 2020

_EQ said:
Hey y’all noob first timer here. I’m getting these weird spots and discolorations and blackish/purple spots one my edges and towards the center of my leaves. Can someone with more experience help me diagnose the problem?

Temps: 80/83F 47%Rh Day/ 60-65F 55%Rh Night
Lighting: 18/6
Nutrients 5g Megacrop plant food/2g Sweet Candy by Megacrop per 1Gallon of tap water
PH: 5.8-5.9
View attachment 4735450 View attachment 4735451 View attachment 4735452 View attachment 4735454 View attachment 4735455 View attachment 4735457 View attachment 4735458 View attachment 4735459

You got some clawing going on. Could have been over fed on the N side. Hard to see the spots clear with the purple light. Meet us half way. Get some natural light in there for us, or use the flash.

kovidkough · Nov 7, 2020

your in soil? ph is too low then

HydroKid239 · Nov 7, 2020

kovidkough said:
your in soil? ph is too low then

Do you happen to know it the bigger patches on the leaves are from it locking out calcium? A normal deficiency usually leaves smaller brown spots, or at least smaller than the patches in the 1st and 3rd pics.. is that right? I've seen both on plants that I've grown, but my first time around I didn't have soil testers. I assumed it was a lockout because of a toxicity... but someone had told me it was a PH lock out. I didn't know if there was a visual difference in PH lockout, toxicity lockout and just the usual deficiency from lacking calcium.

kovidkough · Nov 7, 2020

it would seem more likely the low ph is locking out calcium isn't available at that low ph

_EQ · Nov 7, 2020

kovidkough said:
your in soil? ph is too low then

Sorry I should’ve specified it’s in coco!

Massiveamounts · Nov 7, 2020

Cal mag issue imo. I'm not ed Rosenthal tho

_EQ · Nov 7, 2020

HydroKid239 said:
You got some clawing going on. Could have been over fed on the N side. Hard to see the spots clear with the purple light. Meet us half way. Get some natural light in there for us, or use the flash.

Sorry I didn’t realize how much of a difference in color spectrum the LEDs are compared to normal lighting.

CannabisErecticus · Nov 7, 2020

kovidkough said:
your in soil? ph is too low then

6.2-6.8 works best for soil. calcium, magnesium and phosphorus are the three nutrients that won’t uptake well if the ph of your soil is below 6.0.

CannabisErecticus · Nov 7, 2020

kovidkough said:
it would seem more likely the low ph is locking out calcium isn't available at that low ph

I should have read through the comments you posted the exact same thing lol my fault

_EQ · Nov 7, 2020

CannabisErecticus said:
I should have read through the comments you posted the exact same thing lol my fault

I should’ve specified better my bad My substrate is coco w/ perlite

HydroKid239 · Nov 7, 2020

I'm on board with calcium and magnesium being the issue. I'd start watering with a PH of 5.8-6 asap.

CannabisErecticus · Nov 7, 2020

_EQ said:
Appreciate the response the more research I do the more the symptoms seem to match up with a cal mag deficiency. I’m coming off of a 3 day flush from nute burn. So it makes sense I want to make sure it’s not a nute lock out also. Will do a soil test tmrw morning.

When you said you were going to do a soil test I just assumed it was soil

_EQ · Nov 7, 2020

HydroKid239 said:
I'm on board with calcium and magnesium being the issue. I'd start watering with a PH of 6.5-6.8 asap.

Okay that high with coco though? Or is that the optimal ph for calcium and mag absorption?

_EQ · Nov 7, 2020

CannabisErecticus said:
When you said you were going to do a soil test I just assumed it was soil

Yeah my bad to me rn soil and coco are the same idea but you’re right I should specify better in my posts. Thanks for the inputs I fed yesterday so should I feed @ ph 6.5 or should I just water @ ph 6.5? @HydroKid239 @CannabisErecticus

CannabisErecticus · Nov 7, 2020

_EQ said:
Yeah my bad to me rn soil and coco are the same idea but you’re right I should specify better in my posts. Thanks for the inputs I fed yesterday so should I feed @ ph 6.5 or should I just water @ ph 6.5? @HydroKid239 @CannabisErecticus

Your current ph range is perfect for coco. your leaves do look a little dark and I see a few burned tips, your leaf deficiency is very minimal though.
I would cut back by 1-2 ml on your veg nute. Too much nitrogen can inhibit the uptake of potassium and calcium and calcium and magnesium go hand in hand at 2 parts calcium to 1 part magnesium and you can slightly see these 3 deficiencies here and there through your leaves(potasium and magnesium are mobile nutrients that’s why you see them at different areas on the plant). and with the dark green leaves and a few burnt tips this could very well be the reason your starting to see very minimal deficiencies of these particular nutrients starting

HydroKid239 · Nov 7, 2020

Sorry I fixed that.

_EQ said:
Yeah my bad to me rn soil and coco are the same idea but you’re right I should specify better in my posts. Thanks for the inputs I fed yesterday so should I feed @ ph 6.5 or should I just water @ ph 6.5? @HydroKid239 @CannabisErecticus

_EQ · Nov 7, 2020

CannabisErecticus said:
Your current ph range is perfect for coco. your leaves do look a little dark and I see a few burned tips, your leaf deficiency is very minimal though.
I would cut back by 1-2 ml on your veg nute. Too much nitrogen can inhibit the uptake of potassium and calcium and calcium and magnesium go hand in hand at 2 parts calcium to 1 part magnesium and you can slightly see these 3 deficiencies here and there through your leaves(potasium and magnesium are mobile nutrients that’s why you see them at different areas on the plant). and with the dark green leaves and a few burnt tips this could very well be the reason your starting to see very minimal deficiencies of these particular nutrients starting

Okay sounds good. So should I do a flush with Ph’d water for a few days than feed with cut back on my nutes? When you say 1-2ml I assume you mean 1-2ml per gall of nutes so whatever that is converted into grams per gal.

First timer help!!! Can’t tell if it’s a deficiency or burn!

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