Potato leaves yellowing


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Ok I got a box in the back of a small park, and well the bottom leaves are yellowing but I don't know why I have some garlic on the edge to hopefully repel pests, but I don't know what is causing this I read about a fungus but the stems are not browning like I read on the web, and I added over an inch of compost hoping that would stem any mal nutrition issue. I attached a picture, I am limited to organic solutions due to park rules I could use some help. Sorry for this to be my first post, but I need help
Daniel
AKA
terramir
 

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Your plant is suffering from nitrogen chlorosis. It needs to be fed with fertilizer. Store bought bagged compost has an NPK value of less than 1 and is not intended to be a fertilizer. Go purchase organic fertilizer but make sure it has OMRI written somewhere on the bag.
 
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Potatoes usually yellow as the growing season come to an end. So that's perfectly normal. But you should be cautious if this yellowing happens before the tubers are ready for harvest. Which will mean the potatoes have been infested with psyllid or the wilt fungi is causing the yellowing. Here you'll need the OMRI fertilizer as @Chuck has suggested.

But don't overthink either. The yellowing problem might be a simple watering issue - either you're overwatering the potatoes or you're not watering them enough. So check the soil and see if it's too watery or too dry. This depends on the weather or where the potatoes are, mainly in terms of sunlight exposure. Which also may be a factor to why they're yellowing.

The yellowing might also be due to improper soil pH. So check that too. But I'd advise you to start basic before you go all technical.
 

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