Nutrients dosage for autoflowers ?

Hello, I am going to grow white widow autoflower x3.I am going to use biobizz grow and bloom nuts.My soil is biobizz lightmix.

Keep it light in feeding, like 1/4 strength to start. And then bring it up gradually. Whats the npk of the soil and then what's the value of the nutes?
You may find that the soil is aet on available nutes and if your careful, do regular light feedings as the leaves start looking more lime green to pale.