Vol. 29 No. 1 (1981)

Papers

• Methods for the recovery of nutrients and energy from swine manure. 1. Biogas.

  L. Boersma, E. Gasper, J.E. Oldfield, P.R. Cheeke

  3-14

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• Pretreatment of soil samples before NO3-N analysis.

  T. Breimer, J.H.G. Slangen

  15-22

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• Chemical element detection in thin sections of soils with the Laser Microprobe Mass Analyzer (LAMMA 500).

  E.B.A. Bisdom, S. Henstra, A. Jongerius, H.J. Heinen, S. Meier

  23-36

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• Nitrate poisoning in cattle. 6. Tungsten (wolfram) as a prophylactic against nitrate-nitrite intoxication in ruminants.

  A. Korzeniowski, J.H. Geurink, A. Kemp

  37-47

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• Results of municipal waste compost research over more than fifty years at the Institute for Soil Fertility at Haren/Groningen, the Netherlands.

  S. de Haan

  49-61

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• The anearobic digestion of organic matter in sugar-beet mud

  M.G. Keizer, F.A.M. de Haan, J.J.C. Blom, J.W.M. Knaapen

  63-77

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