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_aRijtema, P. E. _997422 |
| 245 | _aNitrogen emission from grassland farms ; a model approach | ||
| 500 | _aSobretiro de : Proc. Int. Symp. Eur. Grassland Fed on the Role of Nitrogen in Intensive Grassland Production. Wageningen, 1980. pp 137-147 | ||
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_aPastizales. _985916 |
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_aSuelos _xNitrógeno en. _9110451 |
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