Fertilizing Advice Needed

I have few outdoor plants. I went in shop to buy nutrients. Asked about best organic nutrients. He showed me a fertilizer with title Bio Bizz Bio Grow. One for veg and one for bloom phase.

The soil that i purchased has 6 months worth food. Some description:
-PH: 5.2-6.2
-NPK ratio: 1 kg 14-16-18 per m3

Should I use fertilizer or the soil will be sufficient for my plants to grow? They have just 2 cotyledons and 2 new little leaves at the moment, so I suppose it's still not time, but once fertilizing time comes I want to know what to do. Also feel free to put your personal opinion on the suggested brand.

For fun I added a poll. If you have particular preference please vote.

Cheers

I dont know what kinda Soil has 6 months worth of nutes in it but i us FoxFarm Ocean Forest. Hydro store like 17$ and there soil is so rich that i dont add nutes till like week6 then i do half strenth wat the bottle says you really dont wanna do full amount. wat kinda soil is it?

Sk33tINnOObs said:

I dont know what kinda Soil has 6 months worth of nutes in it but i us FoxFarm Ocean Forest. Hydro store like 17$ and there soil is so rich that i dont add nutes till like week6 then i do half strenth wat the bottle says you really dont wanna do full amount. wat kinda soil is it?

Click to expand...

I bought it from ordinary garden shop. It is potting soil from brand Pokon. Contains peat, lime and fertilizers (i supoose synthetic).

Amount of added fertilizer:

-1 kg 14-16-18 (NPK fertilizer with trace elements) per 1 m3
-1 kg 18-6-12 (resin coated NPK with long-acting fertilizer) per 1 m3

Had anyone experience with similar soil?