Got the results yesterday from UMass. They say I need to apply a fertilizer
that has a breakdown of 20-3-12 at 5lbs per 1000 sq ft. I have no idea
where to get this.

An alternative was to apply 2lb of P, 2lb of K, and 1 lb of nitrogen. If I
can't find the mixture above, what would I buy at the HD or garden shop to
accomplish this mix.

Thanks for your time. My lawn looks like hell.