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Applying Biological Science to Agricultural Challenges

Our data-driven approach to biology helps agronomists and farm advisors optimise solutions that enhance plant and soil health for high-value, sustainable production.

Soil and Plant Health

Soil Plant

Microbial Disease Suppression

Metagenomic Soil Testing

Microbial Drivers of Soil Health

Microbial Indicators of Soil Functionality

Microbial Transformation of Organic Matter

Microbial Management of soil health

Biological Control of Phytopathogens

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Figure X. Schematic representation of the multiple biological protective mechanisms of Bacillus spp., adapted from Zhang et al. (2023), Microbial Biotechnology, 16(12), 2250–2263, CC BY-NC-ND 4.0.
Phytopathogens threaten global crop productivity, while chemical controls raise environmental and resistance concerns. Biological control offers a sustainable alternative by employing beneficial microbes such as Bacillus, Pseudomonas, and Trichoderma to suppress pathogens through antibiosis, competition, mycoparasitism, and induced resistance. Integrated use of biocontrol agents supports sd resilient, disease-suppressive agroecosystems.

Induced Systemic Resistance by Microbes

Induced Systemic Resistance (ISR) is a microbe-triggered defense mechanism in plants, mediated by jasmonic acid and ethylene pathways. Initiated by beneficial microbes like Pseudomonas and Trichoderma, ISR primes plant immunity, enhancing resistance to pathogens and abiotic stress. ISR offers a sustainable strategy to bolster crop resilience and reduce chemical inputs.

Microbial Disease Suppression

Soil borne pathogens significantly impact crop productivity, yet microbial biocontrol offers a sustainable, ecologically viable alternative. Beneficial rhizobacteria and fungi suppress pathogens through competitive exclusion, antimicrobial synthesis, enzymatic degradation, and induction of systemic resistance. Effective biocontrol depends on microbial compatibility, environmental conditions, and management practices that support beneficial microbial establishment and activity.

Metagenomic Soil Testing

Great Southern Biology are the Australian distributor for Solena Ag’s advanced metagenomic soil testing. This system uses DNA sequencing to analyze the full genetic profile of soil microbes not just limited markers. Solena’s “Prometheus” platform provides a complete picture of microbial diversity and function, enabling precise, science based recommendations. Unlike conventional tests, this approach uncovers critical insights into soil health, nutrient cycling, and resilience. It empowers agronomists and farmers to make smarter, more sustainable management decisions.

Microbial Drivers of Soil Health

Soil microorganisms are vital to soil health, driving nutrient cycling, enhancing structure, and supporting plant growth. Through diverse biochemical processes, microbes regulate carbon, nitrogen, phosphorus, and sulfur dynamics. They also improve soil stability, suppress diseases, and boost resilience. Managing microbial activity is essential for sustainable, productive agricultural systems and long-term soil fertility.

Microbial Enhancement of Nutrient Uptake

Figure X. Biological roles and mechanisms of Bacillus velezensis within plant microbiomes, adapted from Wang et al. (2021), Frontiers in Agricultural Science and Engineering, 8(1), 1–12. CC BY 4.0. https://doi.org/10.15302/J-FASE-2020374
Soil microorganisms enhance plant nutrient acquisition by mobilizing nitrogen, phosphorus, potassium, and micronutrients through biologically regulated processes. Symbiotic microbes like AMF and nitrogen-fixing bacteria, along with free-living PGPR, improve nutrient solubility and root absorption. Microbial biofertilizers offer a sustainable alternative to synthetic inputs, promoting efficient, resilient, and environmentally sound nutrient cycling.

Microbial Indicators of Soil Functionality

Hartmann, M., Six, J. Soil structure and microbiome functions in agroecosystems. Nat Rev Earth Environ 4, 4–18 (2023). doi.org/10.1038/s43017-022-00366-w
Soil functionality, encompassing productivity, nutrient cycling, and ecosystem support, is closely linked to microbial activity and diversity. Microbial biomass, enzyme activities, and community composition serve as sensitive indicators of soil health. These metrics reveal early signs of degradation and, when integrated into soil health assessments, inform sustainable land management practices.

Rhizosphere Microbiome Dynamics

Figure X. Role of plant growth-promoting rhizobacteria (PGPR) in improving drought tolerance and nutrient efficiency in maize, adapted from Kumar et al. (2023), Frontiers in Microbiology, 14:1163832, CC BY 4.0. https://doi.org/10.3389/fmicb.2023.1163832
The rhizosphere is a biologically active soil zone shaped by root exudates and plant-microbe interactions. Microbial communities here support plant growth via nutrient solubilization, hormone production, and pathogen suppression. Through mechanisms like symbiosis, phytohormone synthesis, and induced resistance, managing the rhizosphere microbiome offers a sustainable pathway to enhance crop resilience and productivity.

Plant Microbiome Interaction

The plant microbiome encompasses diverse microbial communities associated with different plant compartments including the rhizosphere, phyllosphere and endosphere. These microbes play crucial roles in nutrient acquisition, growth regulation, disease resistance, and stress tolerance. By understanding plant microbiome dynamics, we can harness microbial functions to support sustainable agriculture, boost productivity, and reduce reliance on chemical inputs.

Microbial Transformation of Organic Matter

Soil organic matter (SOM) is essential for soil health, with its formation and stabilization primarily governed by microbial processes. Microorganisms decompose organic substrates, regulate nutrient release, and drive carbon cycling. Microbial necromass and mycorrhizal associations contribute to stable SOM pools. Management practices enhancing microbial activity are key to SOM accumulation and climate resilience.

Microbial Management of soil health

Soil health is driven by microbial abundance, diversity, and function. Intensive agriculture disrupts microbial balance, impairing fertility and resilience. Regenerative strategies including bioinoculants, organic amendments, and reduced tillage support beneficial microbes, enhancing nutrient cycling, structure, and disease suppression. Microbial management is central to sustainable agriculture and long-term ecosystem productivity.

Plant Growth-Promoting Microorganisms

Figure X. Network of plant growth-promoting rhizobacteria (PGPR) interactions supporting plants under abiotic stress, adapted from Vocciante et al. (2022), Applied Sciences, 12(3), 1231. CC BY 4.0. https://doi.org/10.3390/app12031231
Plant Growth Promoting Microorganisms (PGPM) enhance plant productivity through nutrient mobilization, phytohormone production, and stress mitigation. Key genera include Bacillus, Pseudomonas, Rhizobium, and AMF. PGPM support plant health via nitrogen fixation, phosphate solubilization, and induced resistance. Their integration into agroecosystems fosters sustainable, resilient, and low-input crop production.
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