sealed room

[shuswap]

ive been running a sealed room for the last few crops,every time between week 2 to 3 i start to get a deficency of magnesium,leaves pale yellow,tips turn up,die.7.2 ph 250 ppm water poured in and runoff was 6.2 ph and 450 ppm,so totally not over fert,so im thinking here,im runing co2 at 1200 right now,i go down into the room 4 hours after lights out and co2 levels are at 1890,holy fuck batman,i realize plants presipre co2 at night but is this normal,and could it be lowering my ph to lock out the magnesium? and ideas guys?

 

[Nader]

keep the co2 under 600 at night if possible, otherwise it can fuck with a few things and it usually takes a couple weeks of high ppm co2 at night to notice changes. Some plants handle it better than others, but in my experience most fucking hate it. possibly rig a way to just exhaust the air after lights out, and raise your lights higher if you can't fix the high co2 at nighttime

 

[teemu shalanie]

the plants r lettting it out ?., u arnt gassing @ night right ?...... possible high C02 in the house or just in grow room?
TS

 

[shuswap]

teemu ,plants do this at night the off gas co2 and breath o2,no gassing at night,theres a photocell on my monitor and yes it is working just in grow room,house is around 5-600 depending on people etc.

nader i understand the idea but i am wondering what others running sealed rooms and soil are doing

 

[Nader]

we exhaust the air after lights out in the rooms that are exhaustible. in the rooms that arent set up for that, i raise the lights after 3 weeks and notice that it helps. furthermore, i've noticed way less issues re: high co2 at night in the rooms with bare vertical bulbs