BC bud

I'm a newbie to the site.have garden outdoors in southern BC.My question is.....the girls have been budding now for almost 6 weeks and the big fan leaves are yellowing what can I use to give some N.i was using fish emulsion once a week then switched to buds n bloom.Should i wash them out and use something with more N?I am certified organic as i have veggie operation as well but i could use something that is not 100% organic