Plants slowly dieing?

jondog123 · #1 12-14-2007, 11:22 AM

For some reason my plants have been slowly dieing. I have been trying to diagnose the problem for probably a month. Hopefully someone can help me figure it out before they really start to flower. I switched them over to 12/12 about four days ago.

The leaves are yellowing from the bottom up. At first the leaves curl under and then they yellow from the tips and soon after the whole leaf cures and dies. When I flushed all my plants on the last one I took at ppm and it read like 1500 just before I put them into 12/12. Does this mean I am getting a nute lockout and my plants may have a Nitrogen deficiency? If so, I would like to know some suggestions for solving my nute lockout.

My ph is around 6.9. The runoff is usually a bit higher, at first close to 8 but then comes down a little after some flushing. When I flushed them, I didn't bring the ppm down all the way, should I try to do this? I am assuming it would take about 20 gallons per plant, because I ran around 8-10 threw my last one it only got down to about 1400 from about 1900. Thanks and any help is greatly appreciated. I just can't seem to figure it out. As you can see in the pictures, the top growth is going pretty well and looks mostly healthy.

I have searched for hours...

jondog123 · #2 12-14-2007, 11:24 AM

more pics....

marky7186 · #3 12-14-2007, 11:25 AM

It's normal from what I've read for leaves to die off from the bottom up.. i just trimmed the ones looking sick and everything was fine afterwards.

potpimp · #4 12-14-2007, 12:09 PM

Yeah, mine's been doing that for a few weeks with no problem. NGT told me not to obsess with them looking perfect.

jondog123 · #5 12-14-2007, 01:01 PM

Quote:

Originally Posted by potpimp

Yeah, mine's been doing that for a few weeks with no problem. NGT told me not to obsess with them looking perfect.

This is true, but if my ppm runoff is 1900, I think I have a problem... I just want to try to diagnose it for future grows, the bottom leaves shouldn't just be slowly dieing off, I am pretty sure it isn't because of light penetration, but I could be wrong. Anyone else?