Stable and labile components of humus in soddy-podzolic soils

Drichko, V. F.; Бакина, Л. Г.; Орлова, Н. Е.

doi:10.1134/s1064229312110038

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Then, HAs were separated from FAs using 0.5 M H 2 SO 4 solution. The amount of labile HAs (HAs1) was estimated by the content in 0.1 M NaOH-extract, stabilized HAs (HAs2) by the difference between the HAs content in 0.1 M Na 4 P 2 O 7 -and 0.1 M NaOH-extracts [24,40].…”

Section: Laboratory Methodsmentioning

confidence: 99%

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

Орлова

Abakumov

et al. 2022

Agronomy

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

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Section: Laboratory Methodsmentioning

confidence: 99%

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

Орлова

Abakumov

et al. 2022

Agronomy

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“…In the world, there are a lot of models which show the alteration of organic matter in soil [1][2][3][4][5][6][7][8][9][10][11]. These models do not take into account the storage of livestock waste organic matter not subjected to humification, which prevents the justification of the periodicity and norm of irrigation with livestock waste.…”

Section: Iiobjects Conditions and Research Methodsmentioning

confidence: 99%

Modelling Humus Reserves with Livestock Wastes Application

Tingayev¹,

Davydov²

2018

International Scientific and Practical Conference "AgroSMART - Smart Solutions for Agriculture" (AgroSMART 2018)

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Application of livestock wastes during three years has exerted generally positive influence on humus storage. Pig effluents application assisted in storing the total forms of nutrient elements in comparison to the benchmark data and control. The more significant storage of nutrient elements in soil and certain increase of organic matter content has been witnessed during the increase of the rate of livestock wastes application from 100 to 300 m3/ ha. A mathematical model reflecting the dynamics of humus reserve by means of livestock waste and plant residues humification and considering humus waste has been developed. The adequacy of the model was analyzed with regards to the data obtained as a result of watering with pig effluents in the meadowsteppe area of Togulsky region in Altai Krai, Russia. The mathematical model has gained high evaluation of approximation accuracy. The approximation error is 6%. The estimate of annual irrigation by pig effluents during 20 years at the rate of wastes equal to 300 m3/ha has indicated the 1.21 times increase of humus reserve from 146.858 ton/ha to 177.87 ton/ha; while the content of non-humified organic matter will increase during 7 years in soil up to 1.19 ton/ha and then the content will stabilize. The 20 year forecast with the irrigation with pig effluents with the norm 300 m3/ha has shown the negligible storage of nonhumified organic matter of pig effluents in soil.

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