Spatiotemporal Patterns of Nitrogen Fertilizer Use Efficiency in Two Cereal Crops in the United States


Jien Zhang1, Chaoqun Lu1 and Peiyu Cao2, (1)Iowa State University, Department of Ecology, Evolution, and Organismal Biology, Ames, United States, (2)Iowa State University, Department of Ecology, Evolution, and Organismal Biology, Ames, IA, United States
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