Help: Yellow leafs w/ brown spots on autoflowering AK-47 & WW

Hi there,

we have a couple of autoflowering feminized plants, that we planted in late April on fresh potting soil. They are planted in 3 gallon pots and get about a gallon of water (just enough for some spill out at the bottom holes) with a little bit of fertilizer (MiracleGo 20-20-20, about 1/4 of the recommended amount) every time the pots are getting light (I checked the ph level a couple of times, its about 6.5-7 with the fertilizer). A few weeks ago the biggest plant started to develop yellow leafs with brown spots. It seem to affect mostly the large sails and not so much the smaller leafs. Now the tow other plants start having the same issue. The 4th one, which is the smallest of the bunch does not have any issues yet. Generally, it seem that the bigger the plants the worse the problem.

I looked online to figure out what it might, be but I possible issues ranged from too little to too many nutrients, to deficiencies of some rather rare elements. Mayby some of you might have an idea?

Growing: outdoors

As cannabis grows the nutrient levels change.

I.e. a seedling does not require what vegetation requires does not require what flowering does.

your current supplement is not right for the auto.

in addition, I’d look at pH for potential lockout issues.

this is a “basic” breakdown of your issue. Someone with more experience can delineate this better for you I hope

Looks like an overall lockout and or deficiency.
Like the previous poster said, quit using the MG. Get some nutes made for the plant, I use Megacrop, get her fed right and give it a few weeks.
This helps me with diagnoses. Best of luck!

.Smoke said:

Looks like an overall lockout and or deficiency.
Like the previous poster said, quit using the MG. Get some nutes made for the plant, I use Megacrop, get her fed right and give it a few weeks.
This helps me with diagnoses. Best of luck!
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Thanks for your help! Looking at the picture, it looks like it might be a combination of Nitrogen and Calcium deficiency, but since there should be plenty of N in the soil, given the MG fertilizer, maybe it's an excess? I have to admit, I find it rather confusing, to distinguish between deficiency and excess... Which megacrop do you mean, the Plantfood 9-6-17 ?