Vol. 31 No. 3 (1983)

Papers

• Effect of soil pH and ammonium and nitrate treatments on heavy metals in ryegrass from sludge-amended soil.

  W. Dijkshoorn, J.E.M. Lampe, L.W. van Broekhoven

  181-188

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• Displacement of lead from polluted top soil by treatment with HCl or FeCl₃.

  M. Hooghiemstra-Tielbeek, M.G. Keizer, F.A.M. de Haan

  189-199

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• Effects of soil covers on air and soil temperature and on growth and yield of sugar-beets.

  L. Sibma

  201-210

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• Ear formation and grain yield of winter wheat as affected by time of nitrogen supply.

  A. Darwinkel

  211-225

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• Effects of applications of sewage sludge and fertilizer nitrogen on cadmium and lead contents of grass.

  O.J. Hemkes, A. Kemp, L.W. van Broekhoven

  227-232

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• Some preliminary results of experiments with in-vitro culture of dipterocarps.

  W.T.M. Smits, B. Struycken

  233-238

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• Notes on determinations of nitrate in plant material.

  I. Novozamsky, V.J.G. Houba, D. van der Eijk, R. van Eck

  239-248

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• Further studies on the effect of fat supplementation of concentrates fed to lactating dairy cows. 3. Effect on rumen fermentation and site of digestion of dietary components.

  S. Tamminga, A.M. van Vuuren, C.J. van der Koelen, H.M. Khattab, L.G.M. van Gils

  249-258

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• Relationships between temperatures and blooming dates of apple trees.

  H.G. Kronenberg

  259-267

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• Effect of fresh water supply on agriculture in the southwest of the Netherlands.

  P.J.M. van Boheemen, P.J. Kusse, C. Maas, J.W. Wesseling

  269-278

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