Can't figure this out..............Calcium excess??

Still spreading but very slowly...........she's drinking slower than normal, maybe another watering with straight water?

No to the light intensity...you're fine.
You're working with a Peat and Bark based media...adjust your pH accordingly.
You're working with a media that has some amendments already in it...consider this.
What are you providing in terms of Mg and Ca ? If you're not; I would.
Good luck friend.

I call it... preventative medicine, always add 5ml ca/mg + 1/4 tsp epsom salt to your base per gallon of water! Why, because its needed by a cannabis plant more than what most people would ever believe. Anyhow, for me, when I see that, its really a "sulfur deficiency", but its not easily identified because you also have a slight "magnesium deficiency".

Lord Bonkey said:

thats why id go with a full strength foliar spray and flush it good

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I used to believe foliar spraying was a waste until I used Optic foliar OG, It really trund things around.

I have the exact same issue!

I'm almost 100% positive this is PH swings
This is my plant showing very similar burnt spots

This is what you get when you google "ph swings weed"

From my understanding (I'm still pretty new to growing), basically just calibrate your ph pen, make sure your water is between 6 and 6.8 and water to 20% runoff to start correcting your ph

I am going agree that it is in fact pH swing. I have the same problem, same markings on leaves,. I checked my soil pH and it was low.

the most accurate way to check the pH of your soil/medium is to dig down about 2 inches and scoop out an ounce of soil and mix it with an ounce of r/o water and stick your pH pen right in it and measure. This is a good time to check your soil's ppm's also by doing the same with your ppm meter. This will tell you exactly what is going on at the root zone. This is far more accurate than measuring run off, because run off is full of salts and unused nutrients that the plant is trying to rid itself of.

So anyhow, I checked my soil pH and it was at 6.2 (kind of low) 6.5 is optimal for my nutrient line. I flushed with water and bone meal pH'd @ 7.0 allowing a lot of run off. When I check it again in a few days after it dries out it should be right where it needs to be at 6. 5or so. It's the pH fluctuation or "swings" that will cause the leaves to show these markings. Once the pH gets straightened out the markings will fade

Mcoocoo said:

So anyhow, I checked my soil pH and it was at 6.2 (kind of low) 6.5 is optimal for my nutrient line. I flushed with water and bone meal pH'd @ 7.0 allowing a lot of run off. When I check it again in a few days after it dries out it should be right where it needs to be at 6. 5or so. It's the pH fluctuation or "swings" that will cause the leaves to show these markings. Once the pH gets straightened out the markings will fade

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thing is, those mark are actually burn marks. Don't think those are going to fade away.

Genki88 said:

thing is, those mark are actually burn marks. Don't think those are going to fade away.

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No they will not fade away.

Ok peeps I want to ask,
What regulates the ph out in nature? Anybody go out in the millions of acres of farm land and regulate the ph in the soil?

No?
I guess its the microbes that regulate the ph out in nature right at the root surface.

I would think that maybe the best thing to do if you want to know that the ph is correct is to calibrate your ph pen correctly and water in at 6.5 and let the microbes do their thing (which you should be using if your growing in soil).

Mcoocoo said:

the most accurate way to check the pH of your soil/medium is to dig down about 2 inches and scoop out an ounce of soil and mix it with an ounce of r/o water and stick your pH pen right in it and measure. This is a good time to check your soil's ppm's also by doing the same with your ppm meter. This will tell you exactly what is going on at the root zone. This is far more accurate than measuring run off, because run off is full of salts and unused nutrients that the plant is trying to rid itself of.

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Unless you are over feeding the plant, the plant isn't trying to rid itself of any salt or nutrients.

Genki88 said:

I don't know the ppm but i'm giving them 4 grams per gallon of water.

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You really need to know what the ppm is if you want to be a good grower. Or I'll say if your new to growing and dont have the skills to do this without a ppm meter you should really get a ppm meter if you want to be a good grower.

Bernie420 said:

Unless you are over feeding the plant, the plant isn't trying to rid itself of any salt or nutrients.

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I didn't mean that the plant was trying to rid itself of anything, simply stating that by allowing runoff, the plant will be albe to get rid of all the accumulated salts that form in the root zone after the nutrients break down

Genki88 said:

thing is, those mark are actually burn marks. Don't think those are going to fade away.

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They may not go away but they will certainly fade as the leaf gets healthier and generates new growth around it

Mcoocoo said:

I didn't mean that the plant was trying to rid itself of anything, simply stating that by allowing runoff, the plant will be albe to get rid of all the accumulated salts that form in the root zone after the nutrients break down

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feed water water feed water feed feed water feed

Bernie420 said:

feed water water feed water feed feed water feed

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to each their own