Here is great advice as published in Total Landscape Care magazine.
Myth: it’s a good idea to remove grass clippings after mowing.
Reality: There is a misconception their grass clippings contribute significantly to thatch. Grass clippings are mostly water and decompose rapidly, returning significant amounts of fertilizer to the lawn. Research shows that up to one-third of applied fertilizer can be recycled by simply returning clippings.
– See more at: http://www.totallandscapecare.com/landscaping/10-most-common-lawn-care-myths/#sthash.u8ADvFnQ.dpuf