To download article.DOI: 10.15507/2658-4123.032.202201.054-070
Calculation Methods of Total Nitrogen and Total Phosphorus Distribution in Pig Manure Fractions
Ekaterina V. Shalavina
Leading Researcher at the Department of Engineering Ecology of Agricultural Production, Institute for Engineering and Environmental Problems in Agricultural Production ‒ Branch of Federal Scientific Agroengineering Center VIM (3 Filtrovskoye Shosse, Saint Petersburg 196625, Russian Federation), Cand.Sci. (Engr.), ORCID: https://orcid.org/0000-0002-7345-1510, Researcher ID: C-1980-2018, This email address is being protected from spambots. You need JavaScript enabled to view it.
Roman A. Uvarov
Researcher at the Department of Engineering Ecology of Agricultural Production, Institute for Engineering and Environmental Problems in Agricultural Production ‒ Branch of Federal Scientific Agroengineering Center VIM (3 Filtrovskoye Shosse, Saint Petersburg 196625, Russian Federation), Cand.Sci. (Engr), ORCID: https://orcid.org/0000-0002-2792-0136, Researcher ID: L-3047-2016, This email address is being protected from spambots. You need JavaScript enabled to view it.
Eduard V. Vasilev
Senior Researcher at the Department of Engineering Ecology of Agricultural Production, Institute for Engineering and Environmental Problems in Agricultural Production ‒ Branch of Federal Scientific Agroengineering Center VIM (3 Filtrovskoye Shosse, Saint Petersburg 196625, Russian Federation), Cand.Sci. (Engr), ORCID: https://orcid.org/0000-0002-5910-5793, Researcher ID: C-1304-2018, This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
Introduction. The study aims to develop and test a comprehensive calculation methodology in a case study of pilot pig complexes to verify reliability of estimates. The methods are required for reliable tracking of the nutrients flow at the farm level and for adjusting the application doses of resulting solid and liquid organic fertilizers with due account for the crop rotation in place, agrochemical analysis of soils, and specific crops to obtain the target yields.
Materials and Methods. Calculations of the content of total nitrogen and total phosphorus in pig manure before separation and in resulting solid and liquid fractions were carried out by the developed method. At that, coefficients from corresponding normative documents and results of previous research were used. Samples of initial material were collected in three replications at two closed-cycle pig rearing complexes located in the Leningrad Region. The experimental data were statistically processed with StatGraphics Centurion v.16 software.
Results. The calculated nutrient content of the manure before separation and the separated solid and liquid fractions was compared with the results of laboratory analysis of the physicochemical composition of the manure and its fractions from the selected pig rearing complexes. The difference between the calculated and average actual values of all considered indicators did not exceed 10%, with the differences in nitrogen content turning out to be much bigger (up to 10%) than the differences in phosphorus content (up to 5.7%) in the solid and liquid fractions of pig manure.
Discussion and Conclusion. The identified differences can be explained by the instrumental uncertainty and heterogeneity of the analyzed initial material ‒ a mixture of excrement and process water. The results of the study confirmed that the developed method is reliable, and it can be used to account for the nutrients in the solid and liquid organic fertilizers in calculating and adjusting doses for certain crops to produce expected yield and reduce the negative impact on the environment.
Keywords: pig-rearing complex, manure, separation, total nitrogen, total phosphorus, solid fraction, liquid fraction
Acknowledgments: The authors are grateful to the editors and reviewers for their attentive attitude to the article and for the indicated remarks, which improved its quality.
The authors declare no conflict of interest.
For citation: Shalavina E.V., Uvarov R.A., Vasilev E.V. Calculation Methods of Total Nitrogen and Total Phosphorus Distribution in Pig Manure Fractions. Inzhenernyye tekhnologii i sistemy = Engineering Technologies and Systems. 2022; 32(1):54-70. doi: https://doi.org/10.15507/2658-4123.032.202201.054-070
Contribution of the authors:
E. V. Shalavina – development of methodology, calculations, sampling, comparison of results, laboratory analyses.
R. A. Uvarov – development of the structure of the article, literary review.
E. V. Vasilev – problem statement, development of methodology.
All authors have read and approved the final manuscript.
Submitted 20.10.2021; approved after reviewing 19.11.2021;
accepted for publication 15.12.2021
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