Grass will not grow in winter months and fertilizer, no matter how good, is not enough, simple as that. Grass has to be around 16 degrees for a sustainable growing rate. As I recall, all pitches were bad in the 70s, in winter and early spring. Unless we install under soil heating and employ a decent groundsman, we will forever face this problem and have players and manager blaming the surface for bad performances. Having said that, there's not much football played on it ! Rant over.