Assessment of Biological Efficiency of Application of Defluorinated Phosphogypsum as Residual Fertilizer
- Authors: Agapova P.V.1, Kiselev M.V.1, Freidkin I.A.1
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Affiliations:
- Saint-Petersburg State Agrarian University
- Issue: No 1(75) (2024)
- Pages: 48-57
- Section: Agronomy, forestry and water management
- URL: https://bakhtiniada.ru/2078-1318/article/view/304751
- DOI: https://doi.org/10.24412/2078-1318-2024-1-48-57
- ID: 304751
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Full Text
Abstract
An important branch of natural fluorapatite processing is the production of extraction phosphoric acid (EPA). More than 95% of the EPC produced is used for the production of mineral phosphate fertilisers, including phosphogypsum. During the detoxification of phosphogypsum, fluorinated phosphogypsum (OF) is obtained, which can be used as a phosphorus fertilizer with a long aftereffect. The aim of this study was to evaluate the biological efficacy and toxicity of defluorinated phosphogypsum in the second year after application in spring oat (Avena sativa) cultivation. Scientific research was carried out by laying a vegetation experiment on the basis of the Federal State Budgetary Educational Institution of Higher Education "Saint-Petersburg State Agrarian University". According to the results of the studies, the following conclusions were made: in the aftereffect of the variants with applied OP, the dynamics of linear growth of spring oats of the variety "Zalp" was approximately the same. At the same time, variants with OF were inferior to the variant with applied Azofoska both in terms of linear growth and productivity. Nevertheless, the results of the vegetation experiment showed that for variants "Fon + OF (0.10 g d.w./kg soil)" and "Fon + OF (0.15 g d.w./kg soil)", where d. w. - P2O5, yield increases compared to background (for grain at standard moisture content) in absolute terms (+ from 0.34 to 1.34 g/m2) and in relative gain (+ 4.4 to 17.5%), confirming the effectiveness of its application in farming. In variants with OF, an increase in the content of mobile phosphorus in the soil was observed in direct dependence on the dose of fertiliser applied compared to the background (+ from 29.5 to 49.0 mg/100 g of soil), which is a very high content. This indicates a pronounced aftereffect. Thus, OF can be used as a multi component mineral fertiliser with obligatory additional study of the influence of strontium and heavy metals contained in it in the system "soil-plant".
About the authors
P. V. Agapova
Saint-Petersburg State Agrarian University
Author for correspondence.
Email: polinaagapova@mail.ru
Junior Researcher of RL «ECOOS» St. Petersburg, Russian Federation
M. V. Kiselev
Saint-Petersburg State Agrarian University
Email: kiselev@spbgau.ru
Cand. Sci. (Agric.), Head of RL «ECOOS» St. Petersburg, Russian Federation
I. A. Freidkin
Saint-Petersburg State Agrarian University
Email: fat3000@mail.ru
Cand. Sci. (Agric.), Leading Researcher of RL «ECOOS» St. Petersburg, Russian Federation
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