yellow leaves at bottom of plants

i flushed yesterday. do i give nutes now? als how is caffienated kush. its a cali strain. auto flowering.

looks like a nitrogen deficiency...just feed some nutes and it'll be fine. when plants are short of nitrogen they get yellow leaves that start at the bottom and work their way up.

as for the 2nd question...never tried it, wish i had....good luck on your grow!!