2025, Vol. 6, Issue 2, Part D
Microbiome modulation of the potato rhizosphere under organic-inorganic nutrient inputs
Author(s): Alessia Romano
Abstract: Potato is a high-input crop whose yield stability and soil sustainability depend heavily on rhizosphere microbial processes that regulate nutrient cycling and disease suppression. This study evaluated how graded organic-inorganic nutrient inputs modulate the potato rhizosphere microbiome and how these shifts relate to soil health and crop performance. A field experiment was conducted using four isonitrogenous fertilizer regimes: T1 (100% recommended mineral NPK), T2 (75% NPK + 25% organic N-equivalent), T3 (50% NPK + 50% organic N-equivalent), and T4 (100% organic N-equivalent). Rhizosphere soils were sampled at tuber initiation and bulking stages, followed by soil physicochemical and enzyme assays, microbial biomass estimation, and high-throughput sequencing of bacterial 16S rRNA and fungal ITS regions. Community diversity, ordination, differential abundance, co-occurrence networks, and predicted functional pathways were analyzed alongside agronomic traits. Integrated nutrient management increased soil organic carbon, microbial biomass carbon, and dehydrogenase activity relative to sole mineral fertilization, with the strongest improvement under T3. Bacterial and fungal alpha diversity also peaked in T3, and beta-diversity ordination showed clear treatment-specific separation, indicating strong microbiome selection by nutrient regime. Beneficial taxa associated with nutrient mobilization and plant growth promotion were enriched under balanced organic-mineral inputs, while pathogen-linked groups declined. Network analysis indicated higher complexity and a greater proportion of positive microbial interactions in integrated treatments, suggesting enhanced ecological stability. Marketable yield was highest under T3, exceeding both 100% NPK and sole-organic regimes without a significant loss in tuber dry matter. Overall, the findings demonstrate that balanced organic-inorganic fertilization synchronizes nutrient availability with microbial habitat quality, generating a diverse, cooperative rhizosphere that supports sustainable potato productivity.
DOI: 10.22271/micro.2025.v6.i2d.272
Pages: 334-340 | Views: 42 | Downloads: 19
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How to cite this article:
Alessia Romano. Microbiome modulation of the potato rhizosphere under organic-inorganic nutrient inputs. J Adv Microbiol Res 2025;6(2):334-340. DOI: 10.22271/micro.2025.v6.i2d.272
