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  1. 1
    Published 1997
    Subjects “...Nitrogen fertilizers....”
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    Diagnosis of the nitrogen status in crops /
  2. 2
    Published 2004
    Subjects “...Nitrogen fertilizers....”
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    Agriculture and the nitrogen cycle : assessing the impacts of fertilizer use on food production and the environment /
  3. 3
    Published 1962
    Subjects “...Nitrogen....”
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    A Review of nitrogen in the tropics with particular reference to pastures : a symposium [held in Brisbane, Feb. 1960] /
  4. 4
    Published 1995
    Subjects “...Nitrogen fertilizers....”
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    Nitrogen fertilization in the environment /
  5. 5
    Published 1969
    Subjects “...Nitrogen fertilizers Congresses....”
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    Nitrogen and soil organic matter : proceedings of a conference organized by the soil scientists of the National Agriculture Advisory Service, October 22nd-23rd 1964.
  6. 6
    Published 1986
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    Nitrogen fluxes in intensive grassland systems /
  7. 7
    Published 1978
    Subjects “...Soils Nitrogen content Congresses....”
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    Nitrogen in the environment /
  8. 8
    by Whitehead, David Charles
    Published 1970
    Subjects “...Nitrogen fertilizers....”
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    The role of nitrogen in grassland productivity : a review of information from temperate regions /
  9. 9
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    Soil nitrogen /
  10. 10
    Published 1991
    Subjects “...Soils Nitrogen content Computer simulation Congresses....”
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    Nitrogen turnover in the soil-crop system : modelling of biological transformations, transport of nitrogen and nitrogen use efficiency : proceedings of a workshop held at the Institute for Soil Fertility Research, Haren, the Netherlands, 5-6 June 1990 /
  11. 11
    Published 1981
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    Soil water and nitrogen : in Mediterranean-type environments /
  12. 12
    Published 1987
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    Nitrogen fixing trees : a training guide.
  13. 13
    Published 1983
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    Temperate legumes : physiology, genetics, and nodulation /
  14. 14
    Published 1977
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    Conference Proceeding Book
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    Soil organic matter studies : proceedings of a symposium /
  15. 15
    by Terziev, Nasko
    Published 1994
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    Influence of kiln and air drying on redistribution of low-molecular sugars and nitrogenous compounds in Scots pine (Pinus sylvestris L.) and consequences for mould susceptibility /
  16. 16
    Published 1977
    Subjects “...Nitrogen Fixation Congresses....”
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    Biological nitrogen fixation in farming systems of the Tropics /
  17. 17
    by Swift, John
    Published 1981
    Subjects “...Nitrogen-fixing trees Papua New Guinea....”
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    Diwai bilong winim gris = Nitrogen-fixing trees /
  18. 18
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    Acid soil and acid rain : the impact on the environment of nitrogen and sulphur cycling /
  19. 19
    Published 1998
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    Carbon and nutrient dynamics in natural and agricultural tropical ecosystems /

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