Sick plant. Total noob.

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Ok so I have started my first hydro grow. Everything seemed to be running fine until I get these weird patches on one my plants. Any help would be awesome. Thanks guys, great forum.
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Looks like your ph is a bit high and that one plant is sensitive to it. In hydro, your ph can go up or down hourly and daily as the plant feeds. 6.1 seems a bit high to me. shoot for 5.6-5.8 and you can go up a bit in flower. Keep your nutes at 1/4-1/2 strength or you will burn/stunt your ladies.
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I agree with Briman. PH is the culprit here. I got the same thing happening to my two autos I have now in soil, fed them too early with tap water,,,,eek.... lol. got exactly the same as you bro, PH probs, crispy bottom leaves, but, don't worry, sort the ph out and it will bounce back ok as your new growth looks nice and healthy.
 
here dude, just to show what i mean, I took some pics of my ladys, a bloody skunk auto and Chemdoggin auto. Check out the bottom leaves :sadcry:
Its all good tho as I sorted my ph problem out about a week ago so you can see that it hasn't spread.:mrgreen:
 

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