50 year trends in nitrogen use efficiency of world cropping systems: the relationship between yield and nitrogen input to cropland

Nitrogen (N) is crucial for crop productivity. However nowadays more than\nhalf of the N added to cropland is lost to the environment, wasting the\nresource, producing threats to air, water, soil and biodiversity, and\ngenerating greenhouse gas emissions. Based on FAO data, we have\nreconstructed th... View More