I try to save this plant from nutrient burns , tel...

If it's not nutrient burn why he's EC so high when he flushes with nearly 150ppm? If it was something else grower wouldn't have problems with EC. Nutrient burn doesn't necessarily mean too much feed. If it dries too fast salts will be deposited and burn the roots even if you have half of recommended dose in nutes or even a third. I think you're on point with your diagnosis @Ganjafarma!

Hi growmie, If you keep the substrate always moist the EC won't fluctuate that much and you won't burn the plant. When it dries a bit salts deposit and EC goes up. If you wan't to really flush it keep running phd water with no nutes untill run off is what you desire. For what I know is almost impossible to overwater in coco. If you check my grow questions there's one with the title "Alien mind reading" answered by @Roberts. All you need is there.

Like Psilocubensis said, this doesn't look like a nutrient burn. At your stage 500 PPM is not that much, thats like 1.3 EC but again Autoflowers need less nutrient then normal type plants. I tried to check out your temperature in your Diary but i don't see any info about that. Why teperature? When looking at your picture you can see some leaves standing high meaning your plants are getting hot and goes into ''protection mode''. What can you do? 1. Do you have a carbon filter? if so, make it run faster so more hot air can escape. 2. Do you have a kind of Air conditioning for your temperature? if so make it colder, 3. Do you have something that can control humidity? if so raise your humidity. The hotter your tent gets the higher humidity you should run. 4. If you have all or some of these things above, you can try to get a perfect climate :) If you still have any doubts, you can and should always give your plants some water with or without enzymen and no other nutrients from time to time. This will clean up old nutrients in your medium(soil), will keep your PPM/EC on a better level, removes salt from nutrients and more. Good luck growing :)

Have you checked for hermied plants has look very seeded to me I hope not for you but sure I see open pollen sacks and balls if pollinated then all will be seeded bubs and you will have to scrap the rest and clean everything before starting again I found the problem with mine was down to the burplel led lights they seem to hermie if you use them so I upgraded my leds to white expensive sort but lost 28 plants with my first attempt and scrapped the purple leds im on round 2 and hopefully no seeds this time the seeds in buds will also be hermied so scrap the whole thing and then smoke it yourself but happy growing

It doesn't seem nute burned, seems maybe light burned, but i would have to see it in other type of light to conclude. https://www.growweedeasy.com/cannabis-symptoms-pictures Also, plant seems amazing!!!

You probably have gotten the run off low enough now. Wait for soil dry a bit then half strength nutes. Until runoff. Then another watering when soil drys a bit. You may be best off doing it that way to keep you ppm in check.