Q. Why is it some times the greens are top dressed after spiking and not other times?
A. This depends on what type of spiking / aeration was carried out and how disruptive it is, by its nature, to the surfaces. If for example it is hollow tining, where a core of soil is removed then it is good practice to work some dressing down into the holes. When using pencil tines however, for normal summer aeration work the holes are tiny and the impact on surface trueness is minimal. When grass growth is very strong it is again good practice to do light topdressing applications to keep the surfaces firm and to “dilute” the build up of any thatch layer. Thatch > decaying leaves and shoots.