Practical information for soil Health.
Practical information for soil health emphasizes the importance of maintaining and stimulating healthy soils to achieve high yielding and quality crops. A healthy soil is characterized by a balanced combination of physical, biological, and chemical properties. Physically, it requires good tilth, porous and stable surface structure, no restrictive subsoil layers, and proper aeration, water storage, and drainage. Chemically, a near-neutral pH, optimal nutrient levels, absence of harmful chemicals, and low salt levels are essential. Biologically, extensive biodiversity and beneficial organisms, including bacteria, fungi, protozoa, and soil fauna, are crucial for resilience against pests, diseases, and environmental stressors like wind, rain, and drought.
Farmers influence soil health primarily through management practices such as crop rotation and the management of soil flora and fauna to enhance biodiversity. A key factor for soil biodiversity is sufficient soil organic matter (SOM), which acts as the foundation of the soil food web. Maintaining a rich soil ecosystem involves applying organic matter regularly from diverse sources, including crop residues, animal manure, green manure, cover crops, compost, and vermicompost. The type and timing of organic inputs affect the development of soil life, with stable materials like wood having slower degradation due to higher C/N ratios.
Soil organic matter is partially decomposed into inorganic nutrients for plants (mineralization), but a stable fraction, humus, forms through humification. The humification coefficient (HC) indicates the stability of SOM, with higher values (e.g., compost) implying more resistant, long-lasting organic matter. Both the active and resistant fractions of SOM contribute to soil health by supporting biological activity, physical structure, nutrient and water retention, and disease suppressiveness.
Soil suppressiveness against soil-borne diseases is linked to microbial biomass and labile carbon, which support diverse and active microbial communities. Managing the C/N ratio influences microbial activity: lower ratios favor bacteria and nutrient mineralization, while higher ratios favor fungi and soil stability. Practices that promote soil biodiversity and prevent compaction—such as avoiding heavy machinery on wet soils—are vital for resilient and productive soils.
When soil problems like diseases occur, remedial measures such as anaerobic soil disinfestation (ASD) or bio-solariation can be used, combined with preventive practices that foster soil biodiversity. Overall, combining preventive soil management with curative strategies ensures a healthy, resilient, and productive soil system, ultimately leading to healthier plants and better crop yields.
practical information for soil Health. (en)
Number of pages: 4
Target countries: The Netherlands
Key takeaways
- Healthy soil resilience is promoted by a balanced combination of physical, biological, and chemical properties.
- A resilient soil can resist or recover from constraints such as pests, diseases, and tough weather conditions, which is essential for high crop yields and quality products.
- Soil biodiversity and organic matter inputs are fundamental for maintaining soil health.
- A diverse soil food web, supported by sufficient organic matter like crop residues, manure, cover crops, and compost, enhances nutrient cycling, soil structure, water retention, and disease suppressiveness.
- The C/N ratio of organic amendments influences microbial activity and decomposition rates.
- Lower C/N ratios favor bacterial growth and quick nutrient mineralization, while higher ratios promote fungal activity and long-term stability of soil organic matter, affecting overall soil fertility.
- The humification coefficient (HC) indicates the stability of organic matter in the soil.
- A higher HC (e.g., compost with 0.9) means more stable soil organic matter, which contributes to physical fertility and long-lasting soil structure improvements.
- Soil suppressiveness against soil-borne pathogens is linked to microbial biomass and labile carbon, not just total organic matter.
- Maintaining active microbial communities through organic matter management can naturally reduce soil-borne disease pressure, although mechanisms are complex and multifaceted.
- Prevention of soil compaction enhances soil resilience and water infiltration.
- A healthy soil structure resulting from organic matter inputs and minimal compaction supports better aeration, water movement, and resistance to heavy machinery pressure.
Sources
- practical information for soil Health. - - https://www.best4soil.eu/assets/factsheets/16.pdf
