Introductory lecture. Development of humus research
during the past Humus et Planta symposia (R. Apfelthaler).
Section A Structure, physical and chemical properties of
humus substances. Application of electron spin resonance
and fluorescence spectroscopies to the study of soil humic
substances (N. Senesi). Applications of pyrolysis-gas
chromatography/mass spectrometry to the study of soils, plant
materials and humic substances. A critical appraisal (C. Saiz-
Jimenez). Section B Relationships among humus soils
properties and fertility. Carbon and nitrogen dynamics in
soil in long term field experiments (M. Körschens). The
role of root properties and organic matter on mobilization of
soil P and rock phosphates (A. Amberger). Influence of organic
carbon and nitrogen associated with cropping history and soil
textural class on nitrogen use by winter wheat (Triticum
aestivum) (L.V. Vaidyanathan, W.S. Wilson). Effect of chemical
properties of soil on humification of organic soil matter with
respect to organic and mineral phosphorus fractions (L.
Kolář, V. Řiha, R. Tichý).
Compensation for organic carbon loss from soil at nitrogen
fertilizer application (V.N. Kudeyarov). Section C
Biotransformations of organic substances in soil.
Biotransformations in different climate belts; source - sink
relationships (H.W. Scharpenseel, H.V. Neue, S.T. Singer).
Availability of carbon and nitrogen contained in different
soil and particle-size fractions (B. Nicolardot, D. Cheneby,
M.R. Allard). The fertilizing value of waste waters from the
olive processing industry (U. Tomati, E. Galli). Microbial