Please help leaves yellow curling up , pics included what did i do wrong???

Hello please help me i dont know what happened but i think it might be too much bloom nutes , but not sure please help me understand what is wrong so it can be avoided next time around, thanks. The leaves are yellow mostly on the top and some of the larger fan leaves have turned yellow as well. SOme cave completly curled up dried up and i had to remove them.

Yeah, it looks pretty burned out.

The veins are what is losing color, and then the leaves are just crisping up and dying. I'm thinking heat and pH are playing their roles as well here.
I'm also going to guess the primary element at fault here is potassium.

Likely this is more a result of a salt build-up and a pH issue in your media. Then the extra heat (top of the plant looks worse) from the light just burned up those leaves that couldn't transpire quickly enough.

Remove the dead leaf matter. Flush your media. Balance the pH, apply some good organics and microbes, and just ride it out to the finish line. You're not looking that far from harvest.

I am haveing the xact same problem. and the answer that I keep coming up with IS Ph being off also maybe Mag Defiency due tio the ph being off I ma going to flush and use some epsom salts.

Great advice Snow Crash im growing under 2 300 watt cfls so i doughts its the heat i have them about 3 to 4 inches away at all time, a question about watering and ph control i use tap water that has a ph of 8.3 after i water the run of is at around 6.6 , should i reduce the ph of the water to 7 or leave it and also what is a simple way to lower ph safely with house products. once again thanks for the help

If you are adding 8.3, and then draining out 6.6 it means the pH of your media could be 4.9, so that's an issue. I think you definitely need to flush.

Use 6.5 to 6.6 pH solution for the flush and continue to balance your water to 6.5 before using it. The pH of your water is a concern. You likely have very high levels of bicarbonates in your water. I really suggest a simple filter (like a brita) to help remove some of those. It might help bring you water back into the safe zone.

It's an crime against people that your water district is sending you water at that pH. You should really look into getting a few 5 gallon jugs and filling them up at the water machine in front of your local grocer.

Lime juice will lower your PH

Yea ill try the lime juice slow3dup thanks , and yea thats the water here in spain its shit. Thanks Snow Crash ill flush in the morning and keep watering untill harvest. They are autos speeddevil and roadrunner both on day 71 from seedling do u think its time to cutt ?

Not yet. I'd have to estimate probably another 9 to 10 days to go without having more information about the trichome profile. I think about 80 days is a good solid number for an auto that isn't especially fast, or one that needed a few days extra for maturity because of stress related issues.

You can do it 2 ways, 1 get a micro 30x or more and wait for 20%+ amber trich or more depending if you like the couch lock =) or 2 you can wait for the hairs turn brown/red about 80%. You'll hear people say the can tell when it ready because it almost glows....I'm not there yet but the more grows under my belt the more I'm under standing the look. Have fun man, maybe take a pic now then when you harvest look at the differences in the appearance.

Haven't tried autos but hear they are great for small spaces. What strain is it?