Applying urea with urease inhibitor (N-(n-butyl) thiophosphoric triamide) in fine particle application improves nitrogen uptake in ryegrass (Lolium perenne L.)
1. School of Biological Sciences , University of Canterbury , Private Bag 4800, Christchurch , New Zealand;2. Institute of Natural Resources , Massey University , Private Bag 11222, Palmerston North , New Zealand