What does this strange yellowing mean?

Last week I had to go out of town for 3 days. The room i grow in is bright in the day so i transport my plant to a closet for the night. so i left it out of light for 3 days.


When I got back this yellowing is the problem i have. What does it mean? it only affects the lower bigger leaves:

How is it doing now?

Never good to leave a planti the dark for 3 days...

cheers

Despite having the stalk split 1 inch down the middle, its doing great. The buds are developing just fine. However, I would like to know what the yellowing means before it becomes a serious problem.

Could be too much salt in the water, this sometimes causes a crisping to the edge of the leaves.

Do you have a white dusty line around the top of the soil, like a rim ? If so check the saltiness of the water you are feeding them with.

Wish you the best.

TeeHC.

Hey mine are doing th exact same thing. I noticed it on two at first, I just assumed the plant was sacrificing the lower leaves to accomodate the new growth up top. Well, I just went ahead and cut the yellowed leaves off, and when I came home today there are two more now that are almost entirely yellow. The thing is, it's only the largest fan leaves, which is what led me to believe they were being sacrificed, or shed basically. My room gets 93 max, only for a few hours, humidy 30-50%, feeding with FFGB every other day, sometimes every three, 400W MH conversion, 2 130 fans I/O.
Ithink my setup is pretty good, I'll post pics. My plant is really looking like crap today though, some of the new lower growth is wilting, but this plant has been a trooper, is survived 2 transplants and rough conditions due to an unfinished setup. It is like 14" tall and is probably almost 2 months old, so it was held back alittle. standart

This ..

This picture is what light bleaching/ light burn looks like.
Only way to fix this is to Move the lights away from the plant!
Or make sure you dont go over 75 watts a sq foot, or your plant will have to much light and light bleaching can occur anywhere on the plant. (indica species seem to bleach easier than sativas imo.

Supertaco said:

This ..

This picture is what light bleaching/ light burn looks like.
Only way to fix this is to Move the lights away from the plant!
Or make sure you dont go over 75 watts a sq foot, or your plant will have to much light and light bleaching can occur anywhere on the plant. (indica species seem to bleach easier than sativas imo.

Click to expand...

Does this apply to CFL's? EX. if i had a 21 sqft box with 12 lights totaling about 350 watts (so 30ish watts/ft) since its under 75 that would work ok?