The effect of integrated application for fertilizers and ameliorants on the microbiocenosis of acidic sod-podzolic soil within the soybean rhizosphere
DOI:
https://doi.org/10.31073/acss100-05Keywords:
soil; soybean; liming; NPK fertilizers; microbiocenosis; nitrogen fixation; agroecosystemAbstract
The article presents the results of a study of the impact of integrated agrochemical land reclamation of acidic (pH=4.09) sod-podzolic sandy loam soil (Albic Arenosols) on the structure and functional activity of soil microbiocenosis in the soybean rhizosphere.
The study was conducted in 2024–2025 at the experimental field of the Institute of Agriculture of Western Polissya NAAS, in
the Rivne region. The field experiment program included 8 treatments combined liming with dolomite flour or calcium carbonate in doses equivalent to 1.0–1.5 units of hydrolytic acidity with differentiated application of NPK fertilizer and two-time foliar feeding with micronutrients. Integrated agromelioration increased soil solution pH to 5.48–6.20 and reduced hydrolytic acidity by 2–3 times. These changes created favorable conditions for the intensification of microbiological processes: the abundance of ammonifying bacteria increased 3.7-fold, reaching a maximum of 18.53 million CFU/g; streptomycetes were activated; and the population of micromycetes decreased 2.8-fold. Organic matter decomposition shifted from a predominantly fungal pathway to a more energy-efficient bacterial pathway. Microbial biomass reached its maximum value of 105.56 μg C/g under the combined application of dolomite flour and moderate fertilizer rates, which was associated with the stabilization of CO₂ emissions. The highest efficiency was observed in treatments based on liming with dolomite flour at a rate equivalent to 1.5 units of hydrolytic acidity combined with micronutrient fertilizers. These treatments promoted the formation of a eutrophic microbiocenosis with a low oligotrophy coefficient of 0.09–0.18 and high metabolic activity. The results demonstrate that integrated agrochemical amelioration can serve as a basis for
the ecologization of agriculture on acidic soils, allowing high soybean productivity to be combined with the preservation of humus balance and biodiversity.
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