Vol. 6 No. 1 (1958)

Papers

• Results of a ground water level experimental field with arable crops on clay soil.

  J.W. van Hoorn

  1-10

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• The cropping of fruit trees in relation to windbreak protection

  J.A. van Rhee

  11-17

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• Observations of the flowering and fructification of the groundnut, Arachis hypogaea.

  G.G. Bolhuis

  18-23

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• Phytophthora palmivora of cocoa and its control.

  D. Tollenaar

  24-38

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• Resistance to the potato root eelworm in S. tuberosum subsp. andigena and its importance for potato breeding.

  C.A. Huijsman

  39-46

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• The relation between rainfall, drain discharge and depth of the water table in tile-drained land

  J. Wesseling

  47-60

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• The problems of standardization of methods in use in microbiological soil research

  K.T. Wieringa

  61-67

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