Humic Acids Formation during Compositing of Plant Remnants in Presence of Calcium Carbonate and Biochar

The investigation of the mechanisms organic matter transformation in compost fertilizers is an urgent task modern soil ecology and chemistry. main components such are newly formed, weakly humified labile humic acids (HAs). objective study to determine mechanism converting formed HAs into forms with increased resistance microbiological biochemical influences. Obtained during plant residues decomposition, were studied incubation experiment (0, 30, 90 days). Calcium carbonate biochar produced by rapid pyrolysis from birch aspen wood, at 550 °C, used as composting mixture compounds. Decomposed residues—fresh aboveground mass clover (Trifolium pratense L.), rye (Secale cereale well dry oat straw (Avena sativa L.) material for humification. To obtain Has, 0.1 M NaOH Na4P2O7 used. Then, separated fulvic (FAs) using a 0.5 H2SO4. amount (HAs1) was estimated their content NaOH. stabilized (HAs2) calculated difference between Preparation elemental composition NMR analysis performed according International Humic Substances Society’s recommendations. possibility stable (calcium humates), whose share reaches 40–50%, has been shown. However, under reagent’s influence different. In presence calcium carbonate, it caused physicochemical processes rearrangement. biochar, this due humification processes’ intensification increase aromatization degree confirmed optical density, carbon oxygen proportion, decrease hydrogen proportion molecules. understanding formation early stages can help optimize methods obtaining fertilizers.