Vol. 27 No. 4 (1979)

Papers

• Anearobic digestion of piggery waste. 3. Influence of temperature

  A.F.M. van Velsen, G. Lettinga, D. den Ottelander

  255-267

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• Nitrate poisoning in cattle. 3. The relationship between nitrate intake with hay or fresh roughage and the speed of intake on the formation of methemoglobin.

  J.H. Geurink, A. Malestein, A. Kemp, A.T. van 't Klooster

  268-276

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• A tentative approach to the molecular structure of humic acids: the spectral evidence for a derivation of humic acids from plant-borne esters. 3. Pyrolysis-mass spectrometry.

  G. Minderman

  277-283

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• Remote sensing of surface roughness and top soil moisture of bare tilled soil with an X-band radar.

  A.J. Koolen, F.F.R. Koenigs, W. Bouten

  284-296

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• The accuracy of analytical data of glasshouse soil testing

  C. Sonneveld

  297-304

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• Effect of dietary levels of calcium on performance of pullets and layers, physical characteristics of the egg, and calcium and phosphorus in plasma and bone.

  A.R. El Boushy, M.C. Papadopoulos

  305-312

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• Erratum

  Anonymous

  313-313

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