Wheat productivity at various N-levels and future predictions under changing climate

• Nitrogen (N) application to agricultural land has increased
  steeply in recent decades.

• Pakistan was among the top four in terms of N use but had low
  mean yields, with the lowest NUE and highest N surplus.

• During 1961–2014 in Pakistan, N fertilizer use, and N surplus
  grew at a much faster pace than mean yields; however, nitrogen
  use efficiency (NUE) continued to decline.