Help identifying yellow spotting

Hi All,

I'm on my first grow, day 26 veg g13 pineapple express. I know this is my first grow but I'm not just trying to get through it, I want to produce good medicine.

I need help identify the reason for yellow spots below. It is on multiple plants and looks more spotty on some of the upper leaves and has more coverage on 1 or 2 lower leaves.

So far based on what I've read I'm suspecting a deficiency of nitrogen, phosphorus, or potassium.

I'm also wondering if it could be caused by the fan I have blowing, maybe too much air? It's 16 inches oscillating between the lights and the plants. Bottom half of the fan is blowing air directly on the plants. Fan is on low and only on when the lights are on.

What other information would help? Thank you in advance for any advice.

that really looks like magnesium deficiency. people say that one half teaspoon in a gallon of water will work as it is magnesium sulphate. you don't have to give the whole gallon, just water thoroughly and that will fine, then give it a few days and see what happens. there are fertilizers out there that have magnesium in them too, but then you are also added other nutrients that may or may not be needed.

polishpollack said:

that really looks like magnesium deficiency. people say that one half teaspoon in a gallon of water will work as it is magnesium sulphate. you don't have to give the whole gallon, just water thoroughly and that will fine, then give it a few days and see what happens. there are fertilizers out there that have magnesium in them too, but then you are also added other nutrients that may or may not be needed.

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I ordered some cal mag today, thnx for the reply.

it will probably have directions on the back, just don't overdose the plant. don't give too much or too frequently, but just enough to fix the problem.

The plant looks hungry IMO have you been feeding that girl at all ....and usually mag def will yellow but the veins in the leaf will be somewhat green still. I'm thinking N def Just giving her food in general just my opinion

ZERG!!!! id check for bugs for sure.

http://www.growweedeasy.com/cannabis-symptoms-pictures

thewanderingjack said:

View attachment 3752310 View attachment 3752311

http://www.growweedeasy.com/cannabis-symptoms-pictures

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I remember looking at these fucking graphs .......don't do it while your stoned cause one problem will turn into eleventeen

Indacouch said:

I remember looking at these fucking graphs .......don't do it while your stoned cause one problem will turn into eleventeen

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haha, so true ...