The earlier conclusions which indicated that soil organic matter could reduce the
phytotoxicity of s-triazines and other preemergent herbicides were drawn from the analysis …

Schematically, a soil is made up of a solid, mineral and organic phase, a liquid phase and a
gas phase. The physical and chemical characteristics of the solid phase result in both …

Soil organic matter (SOM) is one of the most important natural resources and the basis of
soil fertility. The term SOM generally refers to the total organic carbon (C)-containing …

Publisher Summary This chapter deals with humic substances and discusses its chemistry
and reactions. Humic substances, major organic constituents of soils and sediments, are …

Purpose The aims of this paper are to outline the state of knowledge with regard to the
chemistry of soil organic matter (SOM) prior to 1950; then, to review and evaluate the …

The term soil organic matter (SOM), according to Stevenson, refers to the whole of the
organic matter in soils, including the litter, the light fraction, the microbial biomass, the water …

ALTHOUGH lignins are major constituents of plants from which coals are derived, their roles
in the coalification process and resulting coal structures have not been defined. On the basis …

of more than a small fraction of the humic acid “molecule”. Two fundamental characteris-tics
of humic acid appear to be responsible for this impasse:(a) the complex nature of the …

A new model is proposed for the structure of humic acids. In this model humic acid is
pictured as being made up of a hierarchy of structural elements. At the lowest level in this …

In view of the considerable interest in laboratory-prepared fungal “humic acids” as possible
precursors or incorporated structural components of soil humic substances, we degraded …