you'll need to supplement that. The ratios aren't great, either.
seedlings can power themselves for up to 2 weeks. i get better growth with nutes from day 1, but i don't feed at a high concentration and use soilless medium.
soil is a matter of learning balance with the products you use. but the plant still needs building blocks in similar ratios.
now that i think about it... that N is probably lower as far as plant availibility. bet you are closer to a 1-1-1 as far as what the plant is using. probably need a bit more K before anything else.
if it isn't a chelated/plant-ready sources of N, the higher percentage relative to others is misrepresentative of what is actually available to the plant at any one time. takes time for microbes to break it down for use.
observe and react... all you can do. if you stick with same products and take some notes, you can do much better next time and eventually have a good system worked out.