Newbie needs help

[mlz]

Hi,
I need help with my plants. This is the second time this has happened to me.

The plants start off nice, but when they start to flower the leaves turn lime green and the leaves start losing dark green color.
DWC
Auto flower
50% humidity​
1200 ppm
5.9 ph
70-80 degree temp
Kind 420 led light

 

[Need2Know]

The lower leaves will go lighter and some will go yellow and die. That's normal. To keep a plant from going light green/yellow too soon I've done two things. One is I give the plant a very low dose of nitrogen even in flowering. The second thing I do is transplant from a small starter pot when the seed germinates to larger and larger pots with a rough schedule of once a month. That allows the roots to expand and gives more nutrients to the plant all through it's life until the flowering growth spurt stops. Once that happens, stop transplanting and just use fertilizer for flowers with an additional very small amount of nitrogen fertilizer. This seems to keep my plants green longer. Check out the fertilizer schedule for BioBizz online. It takes a few grows to figure it out.