Fractions of nitrogen (including 15N) and also carbon in the soil as affected by different crop residues
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Faculty of Bioengineering and Animal Husbandry, Siedlce University of Natural Sciences and Humanities, B. Prusa 14, 08-110 Siedlce, Poland
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Faculty of Agriculture and Biotechnology, Jan and Jędrzej Śniadecki University of Technology in Bydgoszcz, prof. S. Kaliskiego Ave. 7, 85-796 Bydgoszcz, Poland
Research Group - Stable Isotopes, Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland
Final revision date: 2023-05-19
Acceptance date: 2023-05-29
Publication date: 2023-08-16
Corresponding author
Anna Siczek   

Department of Soil and Plant System, Institute of Agrophysics, Polish Academy of Sciences, Poland
Int. Agrophys. 2023, 37(3): 265–278
  • Transformation of N and C compounds from faba bean and wheat residues was studied
  • Soil Ntot, total hydrolysable-N, humic-N were higher in faba bean than wheat rotation
  • 15N mainly cumulate in easily hydrolysable fraction of SOM
  • Soil chemical profile differs between faba bean and wheat rotation and sampling terms
  • Soil with faba bean residues richer in N than with wheat what reduce N fertilization
Returning crop residue can increase soil organic matter content, and residue quality has an influence over the rate of their turnover. However, there is a lack of information concerning the biochemical transformations of organic compounds of N and C present in the crop residues during subsequent crop growth. In this study, the contents of organic N and C fractions in soils obtained using acid and alkaline hydrolysis under two crop rotations (faba bean vs. wheat rotation) were investigated. Black fallow served as a control. The mean total N increased in the order: black fallow, wheat rotation, faba bean rotation, total C and SOM were higher in the cropped soils than in black fallow. Hydrolysable-N (1-step acid hydrolysis) reached 83.7% total N, amino acid-N and threonine+serine-N were the highest in faba bean rotation and the lowest in black fallow, ammonia-N and aminosugar-N were lower in black fallow than in cropped soils. Hydrolysable-N (2-step sequential fractionation) reached 85.3% total N and significant differ­ences were noted between the cropped soils and black fallow, with respect to both the N and C contents. 15N was mainly accumulated in the N soluble and easily hydrolysable N compounds, and these fractions were greater in cropped soils than in black fallow. N in the humic com­pounds increased from black fallow to faba bean rotation. A PCA analysis showed that crop rotation and soil sampling terms had a substantial influence over cluster formation. An ANOSIM test revealed significant dif­ferences between the crop rotation and term treatments. The results indicated that soil with faba bean rotation is richer in N compounds than soil with wheat as a forecrop and this may result in a reduction in N fertilizers for the succeeding crop.
This work was supported by the National Science Centre in Poland (project number 2016/21/B/NZ9/03588, 2017-2022).
The authors declare no conflict of interest.
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