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Quantitative and qualitative differentiation of organic matter in the bottom sediments are analysed. It has been demonstrated that the coverage of the immediate catchment basin affects the composition of the organic matter in the sediments in the littoral and the changes in the composition of organic matter with depth. The conditions existing in the examined lake favour the formation of humic acids...
Non-uniform germination of reed caryopses (from 0% for most samples to over 90%) at relatively stable temperatures (21 ± 1.9°C and 31.7 ± 1.0°C) and constant light was observed. On the average 70% of caryopses (panicles) kept in room conditions for 3, 5, 10, 20, 40, and 120 days from harvest showed a loss of the ability to germinate only in conditions of culture with a small amplitude of temperature...
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