It is so rare I give ANY form of N other than what is in OF. IF I give, I give bat guano, dried, in the first couple weeks out of the domed tray.

The last repotting is at 21 days into flower, so that is the last time I 'give' nitrogen.

Nitrogen tastes just flipping awful, can't flush it all out if there is too much, the plants seem to hold it.

The longer I grow, the less and more specific the nutrients I give. I can hold all the nute products I give in one hand, so not much in any form.