How fast is foliar-applied nitrogen absorbed?

Nitrogen is applied as a foliar treatment on many putting greens, but just how efficiently, and just how fast is nitrogen taken up using this strategy? In a two year study conducted on bentgrass and bermudagrass greens at the University of Arkansas, Chris Steigler and colleagues\* set out to answer these questions.

Using urea containing radioactively labeled nitrogen (this allows the researchers to quantify very precisely how much nitrogen ends up in leaf tissue, and when it gets there), the…