The Effect of Humic Substances from Oxyhumolite on Plant Development
The results of many investigations have shown that soil organic matter (OM) significantly affects the growth and yield of plants. This effect can be indirect because OM in general influences soil fertility by determining soil physical and chemical properties (air and water conditions, sorption properties and structure) or direct - connected with the uptake of many other processes, for example, protein and nucleic acids synthesis, enzymatic activity, photosynthesis and respiration (Chen and Aviad 1990, Vaughan and Malcolm 1985). Mechanisms of direct interaction between humic substances and plants are not fully explained yet. Many other problems require profound studies. They are, among others, explanation in which phases of plant development humic substances are important and the description of connections between the structure and chemical properties of humic substances and their effectiveness.
KeywordsFiltration Hydroxyl Respiration Carboxyl Geochemistry
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