Originally Posted by RigglePLC
So bad soil causes thatch. But not if ryegrass is growing on it?
Or does excessive nitrogen cause thatch? How much nitrogen? Does compaction cause thatch--if so how much compaction?
To me thatch is a sign of an aggressive cultivar of Kentucky bluegrass...doing what it is supposed to do...get really thick.
Power raking is fine--if the customer believes it will cause quicker greenup in spring. (Probably will not). The brown appearance of certain grass types probably reflects the slow spring greenup of certain high-quality Kentucky bluegrass cultivars...which will look truly excellent later on.
To clarify, if you have excessive thatch with KBG, too much N and compaction are likely causes. KBG won't need or "want" to form excessive thatch if those are addressed. Some thatch, yes, but not un-cosmetic amounts. PRG is not a thatch former no matter what you do -- it does not have rhizomes or stolens, so it can't form thatch. It also does well in compacted soils, where KBG is going to form thatch unless you do a lot of aeration. So that's my thinking on that.