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  1. 41
    Published 1983
    Book

    Soil/land resources evaluation for agriculture Mountain Province
  2. 42
    by Widagda, Linda Christanty
    Published 1983
    Book

    Shifting cultivation and tropical soils patterns, problems, and possible improvements
  3. 43
    Analytics

    Ecological study of the Bontoc rice paddy system a case of human-environment interaction
  4. 44
    Published 1980
    Book

    Standard methods of analysis for soil, plant tissue, water and fertilizer.
  5. 45
    Published 1979
    Book

    Nitrogen and rice
  6. 46
    Published 1978
    Book

    Soil-resource data for agricultural development
  7. 47
    by Moorman, Frans R.
    Published 1978
    Book

    Rice soil, water, land
  8. 48
    by Watanabe, Iwao
    Published 1978
    Analytics

    Biological nitrogen fixation in rice soils
  9. 49
    Published 1978
    Book

    Soils and rice.
  10. 50
    Analytics

    Biological nitrogen fixation in paddy field studied by in SITU acetylene-reduction assays
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