Cold floor causing nitrogen deficiency?

**Freda Felcher** · 01-31-2010, 01:51 AM

Originally Posted by cowboylogic

First off nice job on solving your own problem and sharing the info. Second, I have a raised floor in my grow space. But instead of plywood I use pegboard. Gets your pots up to keep them warm in the winter. You can put a sheet of foam board over it if needed in the winter. Then in the summer it allows for a cool air intake. A few well placed vents at the top and you get a nice natural convection to keep things cool.

I like your idea with the peg board and holes and may incorporate it when I expand out of this 3x3 tent. For now, I have all of the plants propped up on 2x6,s and rubbermaids. I plan to put at least 4-6 inches of insulation foam board down underneath the tent. That should eliminate the cold soil problem I Hope! Here is a pic I took of my tent earlier this evening....

**Freda Felcher** · 01-31-2010, 02:03 AM

Originally Posted by cph

Nice to see you answered your own question!

You really only need to get them off the ground. Even f it's only 1 inch. Allowing air to get under it will make all the difference. I think I'm having the same problem even with my plants about 12" off the ground. But my room gets down into the mid 50s at night, doesn't help when it's fcken 5 degrees outside!!

Good luck!!!

LOL! I know, I did answer my own question kinda, but was more looking for suggestions on insulating the floor. I also hope this helps someone who is in my position. I dealt with this now for close to two months and at times, was ready to bag it. So if nothing more, if this thread helps someone else, it's a complete success in my book!

**mrdrywall** · 01-31-2010, 03:58 AM

i had my plants on cement alsoroom stays about 75 but floor was very coldhad yellow leaves also thought it was nutes at first raised them up 6 incheswith plywood sitting on empty pots seems to have helped a lot stuck my finger into soil and big differance in the temp now and no yellow leaves also buds are larger and still growing month left

**Freda Felcher** · 01-31-2010, 04:28 AM

Originally Posted by mrdrywall

i had my plants on cement alsoroom stays about 75 but floor was very cold had yellow leaves also thought it was nutes at first raised them up 6 inches with plywood sitting on empty pots seems to have helped a lot stuck my finger into soil and big difference in the temp now and no yellow leaves also buds are larger and still growing month left

Thanks for adding your experience with this problem mrdrywall. How long ago did you raise them off the floor and did the color come back noticeably right away?

**mrdrywall** · 01-31-2010, 05:57 AM

Originally Posted by Freda Felcher

Thanks for adding your experience with this problem mrdrywall. How long ago did you raise them off the floor and did the color come back noticeably right away?

i cut yellow ones off and then raised em none came back

**Freda Felcher** · 01-31-2010, 06:08 AM

Originally Posted by mrdrywall

i cut yellow ones off and then raised em none came back

I have trimmed some of the big fan leaves towards the bottom that looked too far gone. But there was also a lot of newer growth toward the top that is yellowing some. I am hoping the younger leaves will return to normal.