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2. Reducing environmental risk by improving N management in intensive Chinese agricultural systems;XT Ju,2009
3. Closing yield gaps through nutrient and water management;ND Mueller,2012
4. The challenge of improving nitrogen use efficiency in crop plants: towards a more central role for genetic variability and quantitative genetics within integrated approaches;B Hirel,2007
5. Grain nitrogen source changes over time in maize: areview;IA Ciampitti,2013