Hey- you don't have to flush organics, or chems, for that matter, when growing in soil. It's a myth!
Anyways, organics can work for you, but it's tough to really monitor what the plant is getting due to varying availability of the elements. Too many factors, such as the efficacy of the N -fixing bacteria and fluctuating ph. That's why using salt based ferts kinda rules-- quick delivery--- you know what you're giving 'em!