Fig. 1From: Emissions of nitrous oxide (N2O) from soil surfaces and their historical changes in East Asia: a model-based assessmentSpatial distribution of nitrogen inputs in East Asia in 2000–2009. a Fertilizer, including both ammonium and nitrate, b organic nitrogen in manure, c atmospheric deposition, including both ammonium and nitrate and both dry and wet depositions, and d biological nitrogen fixationBack to article page