General Hydroponics "Flora Series" three part nutrients are awesome for both hydroponic and soil grows.
They can be mixed to very specific requirements and are very strong, which requires only a tiny amount for each watering.
For soil use, I cut it to 1/8th strength until the plant shows me how it handles it. Then I move the strength up 1/8th strength at a time and watch the plants for any signs of over feeding. As soon as the first tiny amount of over feeding signs appear, I back off to the next lowest mix.
Great stuff. Awesome results.
Will kill your plants if you get crazy and try experimenting with the strength.
Seriously strong stuff.