Transformation of corn plant residues in loamy and sandy substrates

The mineralization and humification dynamics of corn plant residues in loamy and sandy substrates have been studied under laboratory conditions. It has been shown that the dynamics are determined by the undulating development laws of the microbial community under constant temperature and moisture co...

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Bibliographic Details
Published in:Eurasian soil science 2014-05, Vol.47 (5), p.466-477
Main Authors: Mal’tseva, A. N, Zolotareva, B. N, Pinskii, D. L
Format: Article
Language:English
Subjects:
Corn
Earth and Environmental Science
Earth Sciences
Flowers & plants
fulvic acids
Geotechnical Engineering & Applied Earth Sciences
Humic acid
humic acids
Humidity
humification
incubation period
infrared spectroscopy
microbial communities
Mineralization
mineralogy
plant residues
sand
Sand & gravel
Soil Biology
Substrates
Zea mays
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Summary:The mineralization and humification dynamics of corn plant residues in loamy and sandy substrates have been studied under laboratory conditions. It has been shown that the dynamics are determined by the undulating development laws of the microbial community under constant temperature and moisture conditions. At the same time, the intensity and final results of the processes significantly differ depending on the composition and properties of the mineral substrate. The loss of Cₒᵣg during the mineralization and the content of newly formed humic substances reached the maximum values a month after the beginning of the experiment. The mineralization is more intensive in sand at the early stages, and the humification is more active in loam throughout the incubation period. The loamy substrate has better protective properties compared to the sand; therefore, it favors the accumulation of significant amounts of fulvic acids (FAs), along with humic acids (HAs), and causes the relative fulvatization of the humic substances. It has been found using densimetric fractionation and Fourier IR spectroscopy that the different mineralogy of the fractions results in differences in the chemical composition of the formed mineral-organic compounds of newly formed humic substances, mainly due to carboxyl and nitrogen-containing groups. The similarity of the humification products in the heavy fractions of the loamy and sandy substrates has been revealed.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229314050147