subo el ph de mi agua de riego con bicarbonato de sodio pero me sube mucho el ec de mi agua.

It is certainly possible to overfeed your plants! If you're growing an autoflower, your EC is way too high... it's probably pretty high for a photo, too. The best way to raise (or lower) pH is with General Hydroponics PH-Up or PH-Down - being liquid, it's easy to use and does not affect the EC at all but go cautiously until you learn how many drops it takes to raise your water/nute solution to where you want it ... and it's the industry standard... Good luck! And please start a diary for this grow! :-D