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

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      Environmental Research Letters
      IOP Publishing

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          Journal
          Environmental Research Letters
          Environ. Res. Lett.
          IOP Publishing
          1748-9326
          October 01 2014
          October 01 2014
          : 9
          : 10
          : 105011
          Article
          10.1088/1748-9326/9/10/105011
          ae559d53-e985-4187-8f4e-4f332bcafe8a
          © 2014
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