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The present investigation was carried out in the period 1977-1981
at the Department of Soil Science and Plant Nutrition of the
Agricultural University Wageningen, Netherlands. This university
supplied the major financial sup port through a research grant,
with additional financial support rendered by the Dutch Nitrogen
Fertilizer Industry and Unilever Research, Netherlands. This
support is gratefully acknowledged. In the present form this report
is the author's doctoral dissertation submitted to the Faculty of
the Agricul tural University. The author hereby wishes to thank
prof. dr. ir. A. van Diest for his criti cal reading and correction
of the English text, and drjr. J. H. G. Slangen for his valuable
advices during the investigations and in the course of the
preparation of this report. The au thor also acknowledges the
valuable support received from several Agricultural Research
Institutes and University Depart ments which made facilities and
manpower available to conduct the ex periments and to transform the
results obtained into the present report. Contents Preface / v
Abstract / 1 List of ab breviations / 2 Introduction / 3 2
Literature / 6 2. 1 Nitrogen transformations in soil / 7 2. 2
Nitrate uptake / 7 Nitrate reduction in plants / 7 2. 3 2. 4
Nitrate contents in plants / 8 2. 5 Cultural measures / 9 2. 5. 1
Nitrogen dressing / 9 2. 5. 1. 1 Nitrogen amount / 9 2. 5 . 1."
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