Vol. 27 No. 1 (1979)

Papers

• A study into the mobility of iron in podzolized Sarawak upland soils by means of selective iron extractions.

  J.P. Andriesse

  1-12

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• Competition between Hordeum vulgare L. and Chenopodium album L. with different dates of emergence of Chenopodium album.

  W.T. Elberse, H.N. de Kruyf

  13-26

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• Drainage criteria for soil workability.

  L.K. Smedema

  27-35

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• The crude protein production of grassland and the utilization by milking cows.

  A. Kemp, O.J. Hemkes, T. van Steenbergen

  36-47

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• The influence of photoperiod on head formation in some Brachiaria species and Chloris gayana cv. Masaba.

  J.G.P. Dirven, L.J.M. van Soest, K. Wind

  48-59

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• Volatile fatty acids in anaerobically stored piggery wastes

  S.F. Spoelstra

  60-66

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• An agricultural analysis of rainfall reliability for Cameroon.

  H.J.W. Mutsaers

  67-78

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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. 1. The electron paramagnetic resonance (EPR) spectra.

  G. Minderman

  79-91

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• A comparison of the behaviour of some root systems under restricted aeration.

  L.K. Wiersum

  92-98

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• Nitrogen uptake by rice plants from a dry soil at maintained water supply from a greater depth.

  S.B. Rehatta, W. Dijkshoorn, J.E.M. Lampe

  99-110

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