Presumably the delay in sub-surface NO3- with CRN use is a result of more efficient use by the pasture species, reducing the quantities of N lost due to excessive NO3-and NH4+ pools.

• 可以推测，施用控释氮肥延缓地下水中NO3-的积累是牧草对氮的利用率较高所致，这样就会降低由于过量NO3和NH4+的积累而引起的氮素损失。