rusty colored, crispy feeling leaves, any ideas

I thought this was due to over trimming, but now i notice the spots forming on another plant in the box. Humidity stays around 28-33, and their on the 5th week of flowering. I use faucet water that i let sit in a bucket for a day before using. Oh and if its a mag def, how would I add dolomite lime to the soil of an already potted plant? Any ideas?

is it only on the tops, it could be too close to the light, too much heat

capncash said:

is it only on the tops, it could be too close to the light, too much heat

Click to expand...

It looks worse on the tops but I notice the lil rusted spots on various leaves of the plant, their under 6 42w cfls which are mounted behind plexiglass in the upper chamber of my rubbermaid box so I doubt its a heat/too close to light issue.

you can get cal/mag at most hardware stores and add to water

capncash said:

you can get cal/mag at most hardware stores and add to water

Click to expand...

this guy's got it right. get cal/mag, use 6-10ml per gallon, all through flower. you'll be happy you did (and i'm going to let the why be a surprise)

go to longs and get epsom salt...its magnesium sulfate....add 2tsp per gallon and feed...watch the tops to see the color come back first....

thx for the advise gardeners, Ill grab some salt today, and I frequent lowes often, whats the product name of this cal/mag that i can simply add to water? Also I noticed the soil of the plants that are showing those signs on leafs, are still showing mid to high moisture when i stick the meter in, and other plants are more on the dryside. Think the bad drainage in those plants showing bad signs could be the cause? Used ocean blend but didnt mix with verm/lime/perlite.

heres some other shots to see deficientcy from