You should soil test before you plant. I tried it the way you plan to and I had a extreme potash deficient plot and I wasted a year because I used 13-13-13 and it was way off from what was needed. THe plot struggled and in the summer I lost it all. The plants developed slowly and just couldn't compete with the grass.

I test every field before I plant and I have had great success the last few years with clover.

Good Luck

SB