nujtrient deficiency

We are new to growing and can't seem to get it right. We are growing hydroponically and get through cloning, vegetation, then all heck breaks loose after the second week of flowering. Fan leaves get yellowish/brownish spots between veins and crop goes downhill...Suspected Magnesium deficiency but have added 1/2 teaspoon of Epsom salts per gallon for two weeks with no apparent improvement...

Help

forget the salt.......hydrophonics then, try something from the nursery like big grow

That doesn't look like the MG deffecancy that I had. It look just like the ph issue I had. My plants did then when I didn't keep checking the ph and I let it get way too high, then I got it down and it went sky high again. It has to be from fluxuation (sp?). Just make sure your ph stays relativly the same. a couple points in either direction is ok but not too much!!

PH stays between 5.5 and 6.0, checked and adjusted daily....Will check out Big Grow

Thanks

mrmagu said:

PH stays between 5.5 and 6.0, checked and adjusted daily....Will check out Big Grow

Thanks

Click to expand...

What is the air/water temp at?
Are you misting them with an HID light on at the same time?

Water temp 67-70, air 83-85 days 64-70 nights CO2 during day, not misting

Bump it up