Water Soluble Chitosan Agriculture: Composition, Classification, and Industrial Applications

Types of Water-Soluble Chitosan in Agriculture

Water-soluble chitosan is a versatile biopolymer increasingly used in sustainable agriculture. Derived from chitin—a natural polysaccharide found in crustacean shells—chitosan is modified to enhance its solubility and functionality in aqueous environments. These modifications result in various forms of water-soluble chitosan, each differing in degree of deacetylation, molecular weight, and solubility profile. These variations allow tailored applications across crop protection, soil enhancement, plant growth stimulation, and stress mitigation.

Below is a comprehensive overview of the most common types of water-soluble chitosan used in agriculture, detailing their properties, benefits, and ideal applications.

Chitosan Oligosaccharides

Low-molecular-weight derivatives produced via chemical or enzymatic depolymerization of chitosan. Highly soluble in water (especially at low pH), they are readily absorbed by plant cells.

Advantages

• Excellent water solubility
• Direct cellular uptake by plants
• Strong elicitor of plant defense responses
• Enhances seed germination and root development
• Improves nutrient absorption efficiency

Limitations

• Higher production cost due to processing
• Limited persistence in soil
• Requires frequent application

Best for: Foliar sprays, seed priming, biostimulants, and early growth stage treatments

Native Chitosan

The raw, non-derivatized form extracted from chitin. It has limited water solubility and typically requires acidification (e.g., dilute acetic acid) for dissolution.

Advantages

• Cost-effective and widely available
• Natural biodegradability
• Good film-forming properties
• Effective in controlled-release systems

Limitations

• Poor solubility in neutral or alkaline water
• Requires pH adjustment for use
• Less bioavailability to plants

Best for: Coatings for seeds, controlled-release fertilizers, and pesticide encapsulation

Chitosan Acetate

Produced by dissolving chitosan in acetic acid, resulting in a stable, water-soluble salt form. Offers improved solubility and handling characteristics.

Advantages

• High solubility in acidic conditions
• Stable formulation for liquid products
• Enhances microbial activity in rhizosphere
• Effective in foliar and soil drench applications

Limitations

• May lower soil pH with repeated use
• Not suitable for alkaline irrigation systems
• Requires careful storage to prevent degradation

Best for: Bio-stimulant sprays, seed treatments, and organic farming systems

Carboxymethyl Chitosan

A chemically modified derivative with carboxymethyl groups attached, significantly enhancing solubility in neutral and alkaline solutions.

Advantages

• Excellent water solubility across pH ranges
• Enhanced antimicrobial and antifungal activity
• Promotes root elongation and nutrient uptake
• Compatible with a wide range of agrochemicals

Limitations

• More expensive than native forms
• Synthetic modification may limit organic certification
• Requires precise dosing to avoid phytotoxicity

Best for: Hydroponics, alkaline soils, and integrated pest management programs

Chitosan Sulfonate

Created through sulfonation using sulfuric acid or sodium bisulfite, this derivative exhibits high water solubility and strong antioxidant properties.

Advantages

• Highly soluble even at neutral/alkaline pH
• Potent antioxidant activity
• Reduces oxidative stress in plants
• Improves resilience to drought and heat

Limitations

• Complex and energy-intensive production
• Higher cost compared to basic derivatives
• Limited availability in commercial markets

Best for: Stress-relief treatments, abiotic stress mitigation, and climate-resilient farming

Epichlorohydrin Cross-Linked Chitosan

A modified chitosan network formed by cross-linking with epichlorohydrin, creating a stable, porous matrix for slow release.

Advantages

• Controlled and sustained release of nutrients/pesticides
• Improved soil retention and reduced leaching
• Enhances soil structure and water-holding capacity
• Long-lasting effects in field conditions

Limitations

• Not readily biodegradable due to cross-linking
• Potential environmental concerns with residual epichlorohydrin
• Primarily used in industrial formulations, not direct application

Best for: Controlled-release fertilizers, soil amendments, and precision agriculture systems

Expert Tip: When selecting a chitosan type, consider your soil pH, crop type, and application method. For example, use carboxymethyl chitosan in alkaline soils and chitosan acetate in organic foliar sprays. Always conduct a small-scale compatibility test before large-scale use to avoid phytotoxicity or formulation instability.

Features of Water-Soluble Chitosan in Agriculture

Water-soluble chitosan is a highly versatile biopolymer revolutionizing modern agriculture through its natural, sustainable, and multi-functional properties. Derived primarily from chitin found in crustacean shells, chitosan undergoes chemical or enzymatic modification to become water-soluble—making it ideal for integration into various agricultural systems. Its ability to enhance plant growth, improve stress resilience, and support eco-friendly farming practices has made it a key component in sustainable crop management strategies.

Key Features and Agricultural Benefits

High Solubility in Water

Natural chitosan is inherently insoluble in water, limiting its agricultural use. However, through treatment with mild organic acids like acetic acid, it forms water-soluble chitosan acetate. Alternatively, depolymerization produces chitosan oligosaccharides, which are readily soluble in aqueous solutions regardless of pH.

This enhanced solubility enables seamless integration into liquid fertilizers, foliar sprays, seed coatings, and irrigation systems. It ensures uniform distribution across plant surfaces and root zones, maximizing bioavailability and effectiveness. This feature is particularly valuable for precision agriculture and drip-fertigation systems.

Bio-Stimulatory Properties

Water-soluble chitosan acts as a powerful biostimulant by interacting with plant cell receptors via its positively charged primary amino groups. This interaction triggers a cascade of physiological responses that enhance overall plant development.

It stimulates root initiation and elongation, leading to stronger root systems that improve nutrient and water uptake. Additionally, chitosan promotes flowering, fruit set, and seed germination rates. These effects contribute to earlier maturity, improved crop uniformity, and higher yields—especially under suboptimal growing conditions.

Stress Resistance Enhancement

One of the most valuable features of water-soluble chitosan is its ability to prime plants against abiotic stresses such as drought, salinity, extreme temperatures, and heavy metal toxicity.

It activates systemic acquired resistance (SAR) and upregulates stress-responsive genes, leading to increased synthesis of protective compounds like proline, antioxidants (e.g., superoxide dismutase), and heat-shock proteins. These biochemical defenses help maintain cellular integrity and metabolic function during environmental challenges, reducing yield losses and improving crop resilience.

Antimicrobial Activity

Water-soluble chitosan exhibits broad-spectrum antimicrobial properties against bacteria, fungi, and certain viruses. Its positively charged molecules bind to negatively charged microbial cell membranes, disrupting membrane integrity and causing leakage of intracellular contents.

In addition to direct pathogen suppression, chitosan induces the plant’s innate immune system by stimulating the production of pathogenesis-related (PR) proteins, phytoalexins, and lignin deposition at infection sites. This dual action makes it an effective component in biopesticides and disease management programs, reducing reliance on synthetic fungicides and bactericides.

Enhancement of Nutrient Uptake

Chitosan improves the bioavailability and uptake efficiency of essential nutrients such as nitrogen, phosphorus, potassium, and micronutrients. It can form complexes with these nutrients, protecting them from leaching and volatilization in the soil.

When used as a coating on fertilizers, chitosan enables slow and controlled release of nutrients while simultaneously enhancing root membrane permeability. This synergistic effect leads to better nutrient absorption, reduced fertilizer requirements, and minimized environmental pollution—making it ideal for sustainable nutrient management practices.

Eco-Friendly and Biodegradable

As a naturally derived polymer from renewable sources—primarily shellfish waste—chitosan is both biodegradable and non-toxic to humans, animals, and beneficial organisms. It breaks down into harmless byproducts in soil and water, leaving no persistent residues.

This makes it a preferred alternative to synthetic agrochemicals in organic farming and integrated pest management (IPM) systems. Its low environmental footprint supports circular economy principles by repurposing seafood industry byproducts into high-value agricultural inputs.

Multiple Agricultural Applications

Water-soluble chitosan is highly adaptable and can be applied across various stages of crop production:

• Seed Treatment: Coating seeds with chitosan enhances germination, protects against soil-borne pathogens, and boosts early seedling vigor.
• Foliar Sprays: Applied directly to leaves, it strengthens plant defenses, improves photosynthetic efficiency, and mitigates stress damage.
• Soil Amendment: Improves soil structure, stimulates beneficial microbial activity (e.g., nitrogen-fixing bacteria), and suppresses harmful pathogens.
• Biofertilizers & Biopesticides: Used as a carrier or active ingredient in eco-friendly formulations to enhance efficacy and shelf life.
• Post-Harvest Treatment: Extends shelf life of fruits and vegetables by forming a protective edible coating that inhibits microbial growth and reduces water loss.

Support for Sustainable Farming

With increasing global demand for sustainable agriculture, water-soluble chitosan aligns perfectly with regenerative and organic farming goals. It reduces dependency on chemical inputs, enhances soil health, and contributes to climate-smart practices by improving carbon sequestration through healthier root systems.

Its compatibility with other biologicals (e.g., mycorrhizae, Trichoderma) and minimal phytotoxicity make it a safe and effective tool for farmers aiming to increase productivity while preserving environmental quality. Research continues to expand its applications in vertical farming, hydroponics, and urban agriculture systems.

Important: While water-soluble chitosan is generally safe and compatible with most crops, optimal results depend on proper dosage, timing, and application method. Over-application may lead to phytotoxicity in sensitive species. Always follow product guidelines and conduct small-scale trials before large-scale implementation. Additionally, sourcing chitosan from reputable suppliers ensures consistent molecular weight and degree of deacetylation—key factors influencing its biological activity.

Uses of Water-Soluble Chitosan in Agriculture

Water-soluble chitosan is a biodegradable, non-toxic biopolymer derived from chitin, primarily found in crustacean shells. Its unique chemical structure enables it to interact effectively with plant cells and soil components, making it a versatile tool in sustainable agriculture. As a natural alternative to synthetic inputs, chitosan supports eco-friendly farming practices while enhancing crop productivity, resilience, and post-harvest quality.

Bio-stimulant for Enhanced Growth

Water-soluble chitosan acts as a powerful bio-stimulant that significantly enhances seed germination, root development, and overall plant vigor. It functions by binding to specific receptors on plant cell membranes, triggering intracellular signaling pathways that stimulate the synthesis of growth hormones such as auxins and cytokinins.

• Accelerates early seedling emergence by improving water and nutrient uptake during germination
• Promotes lateral root formation and increases root surface area for better anchorage and absorption
• Boosts photosynthetic efficiency and chlorophyll production, leading to greener, more robust foliage
• Increases crop yields by up to 20–30% in various field and greenhouse trials

Scientific insight: Chitosan mimics pathogen-associated molecular patterns (PAMPs), which primes the plant’s innate growth mechanisms even in the absence of stress.

Stress Mitigation and Environmental Resilience

One of the most valuable properties of chitosan is its ability to help plants withstand abiotic stresses such as drought, salinity, extreme temperatures, and oxidative damage. It activates systemic acquired resistance (SAR) and upregulates stress-responsive genes that produce protective proteins and antioxidants.

• Reduces water loss by enhancing cuticle formation and stomatal regulation under drought conditions
• Improves membrane stability and reduces lipid peroxidation during heat or cold stress
• Enhances osmotic adjustment through accumulation of proline and other compatible solutes
• Supports recovery after stress events, minimizing yield loss during critical growth stages

Field application tip: Apply chitosan foliar sprays before predicted weather extremes for preventive protection.

Soil Health and Microbial Activity

Chitosan plays a crucial role in improving soil structure and fostering a thriving microbial ecosystem. As a carbon-rich organic polymer, it serves as a food source for beneficial soil bacteria and fungi, including Trichoderma and Bacillus species.

• Stimulates microbial biomass and enzymatic activity, enhancing organic matter decomposition
• Promotes aggregation of soil particles, improving aeration, water infiltration, and erosion resistance
• Encourages nutrient cycling by boosting populations of nitrogen-fixing and phosphate-solubilizing microbes
• Suppresses harmful pathogens through competitive exclusion and antimicrobial action

Long-term benefit: Regular use contributes to building sustainable, living soils with increased cation exchange capacity (CEC).

Nutrient Delivery and Fertilizer Efficiency

Chitosan enhances nutrient availability and uptake by acting as a natural chelating agent. It forms stable complexes with essential micronutrients like iron, zinc, and manganese, preventing their precipitation in alkaline soils.

• Improves solubility and mobility of phosphorus, reducing fixation in clay and calcareous soils
• Facilitates translocation of nutrients from roots to shoots due to its positive charge interacting with plant vascular systems
• Used in nano-encapsulation and slow-release fertilizer formulations for controlled nutrient delivery
• Reduces leaching of nitrogen and potassium, minimizing environmental impact and input costs

Innovation note: Chitosan-based nanocarriers are being developed for targeted delivery of fertilizers and pesticides.

Pest and Disease Management

Water-soluble chitosan is a key ingredient in bio-pesticides and bio-control strategies. It elicits the plant’s natural defense mechanisms by inducing the production of phytoalexins, pathogenesis-related (PR) proteins, and lignin deposition at infection sites.

• Effective against fungal pathogens such as Fusarium, Botrytis, and Phytophthora
• Deters insect feeding by altering plant surface chemistry and palatability
• Activates systemic resistance similar to vaccination, providing broad-spectrum protection
• Used in seed coatings and soil drenches to prevent damping-off and root rot diseases

Eco-friendly advantage: Leaves no harmful residues and is safe for pollinators and beneficial insects.

Post-Harvest Protection and Shelf-Life Extension

Chitosan forms a semi-permeable, edible coating on fruits and vegetables that acts as a physical barrier against microbial invasion and moisture loss. This makes it ideal for reducing spoilage and extending marketability.

• Reduces weight loss and maintains firmness in apples, tomatoes, berries, and citrus fruits
• Inhibits mold and yeast growth on produce stored under refrigeration or ambient conditions
• Delays ripening and senescence by modulating ethylene production and respiration rates
• Compatible with organic certification standards when derived from sustainable sources

Commercial application: Widely used in packing houses as a dip or spray treatment before storage or transport.

Expert Recommendation: For optimal results, integrate water-soluble chitosan into a holistic crop management plan. Use it as a seed treatment at planting, foliar spray during vegetative and flowering stages, and post-harvest dip for produce. Combine with compost teas or beneficial microbes to amplify soil and plant health benefits. Always follow label instructions for concentration and frequency to avoid over-application.

Additional Considerations

• pH Sensitivity: Chitosan dissolves best in slightly acidic solutions (pH 4.5–6.0); avoid alkaline mixing water to prevent precipitation
• Compatibility: Test for tank-mix compatibility with other agrochemicals; avoid combining with strong oxidizers or anionic surfactants
• Organic Certification: Verify source and processing method—some chitosan products are OMRI-listed for organic use
• Environmental Impact: Biodegradable and non-accumulative, making it suitable for sustainable and regenerative agriculture systems
• Economic Return: Despite higher upfront cost than synthetics, chitosan often delivers better long-term ROI through improved yields and reduced losses

How to Choose Water-Soluble Chitosan in Agriculture

Water-soluble chitosan has emerged as a powerful bio-stimulant and natural defense enhancer in modern sustainable agriculture. Derived from chitin, this biopolymer promotes plant growth, improves stress resistance, and suppresses pathogens without harmful chemical residues. However, not all chitosan products are created equal. Selecting the right water-soluble chitosan requires careful evaluation of several key factors to ensure maximum efficacy, safety, and compatibility with your farming system.

Important Note: Always verify the source and purity of chitosan, especially if used in organic farming or near sensitive ecosystems. Poor-quality chitosan may contain allergens, heavy metals, or inconsistent active ingredients that compromise crop health and regulatory compliance.

Critical Factors When Choosing Water-Soluble Chitosan

1. Source of Chitosan

   Chitosan is primarily derived from the exoskeletons of crustaceans such as shrimp, crab, and lobster. High-quality chitosan is sourced from clean, pollution-free marine environments to minimize contamination from heavy metals, pesticides, or industrial pollutants. Some advanced formulations use chitosan from fungal or insect sources—ideal for vegan or allergen-sensitive applications.

   Always choose chitosan from reputable suppliers who provide traceability and batch testing. Standardized sourcing ensures consistent purity, concentration, and molecular characteristics, which are essential for reliable performance across growing seasons.

2. Molecular Weight

   The molecular weight (MW) of chitosan significantly influences its solubility, bioavailability, and mode of action in agricultural systems:

   • High Molecular Weight (HMW) Chitosan (>500 kDa): Enhances soil structure by promoting aggregation and water retention. It stimulates beneficial microbial populations and acts as a slow-release elicitor of plant defense mechanisms.
   • Low Molecular Weight (LMW) Chitosan (100–500 kDa): Offers superior solubility and rapid uptake. Ideal for foliar sprays, seed treatments, and hydroponic systems where quick absorption through leaf stomata or root zones is critical.
   • Oligochitosan (<100 kDa): Extremely bioactive; triggers strong immune responses in plants at very low concentrations. Often used in disease suppression and stress mitigation protocols.

   Select the appropriate MW based on your application method and desired outcome—soil conditioning vs. foliar nutrition vs. pathogen control.

3. Degree of Deacetylation (DoD)

   The degree of deacetylation refers to the percentage of acetyl groups removed from chitin during processing. A higher DoD (typically >75%) increases the number of free amino groups, enhancing:

   • Water solubility in weakly acidic solutions
   • Cationic charge density, improving binding to negatively charged cell walls of fungi and plant membranes
   • Antimicrobial activity against bacteria and fungi
   • Bio-stimulatory effects on root development and nutrient uptake

   For most agricultural applications, aim for chitosan with a DoD between 80% and 95%. This range provides optimal solubility, stability, and biological activity. Lower DoD values may result in poor dissolution and reduced effectiveness.

4. Chitosan Concentration

   The effective concentration varies depending on the crop, growth stage, and intended use:

   • Plant Growth Promotion (Bio-stimulant): 0.01% to 0.5% w/v (100–500 mg/L). Low concentrations stimulate root elongation, chlorophyll synthesis, and overall vigor.
   • Disease Suppression: 1% to 5% w/v (10–50 g/L). Higher concentrations create a physical barrier on plant surfaces and directly inhibit spore germination of pathogens like Fusarium, Botrytis, and Phytophthora.
   • Seed Treatment: 0.1% to 0.3% solution for soaking seeds to enhance germination and early seedling resistance.

   Always follow label instructions and conduct small-scale trials before large-scale application, as overdosing can lead to phytotoxicity in sensitive crops.

5. Formulation and Stability

   Water-soluble chitosan is often formulated with organic acids (e.g., acetic, lactic, or citric acid) to maintain solubility and pH balance. These formulations improve shelf life and ease of mixing with other agricultural inputs.

   Look for products that include stabilizers or dispersants to prevent precipitation, especially in hard water conditions. Stable formulations remain clear and homogeneous, ensuring uniform spray coverage and consistent dosing. Avoid products that form gels or particulates upon dilution.

   Proper storage (cool, dry place away from direct sunlight) is crucial to maintain long-term stability.

6. Compatibility with Other Agrochemicals

   Chitosan is generally compatible with many fertilizers, micronutrients, and biological agents. However, it may interact negatively with highly anionic substances (e.g., certain surfactants, phosphate-based fertilizers) or alkaline solutions (pH >7.5), leading to coagulation or reduced efficacy.

   Always perform a jar test before tank mixing: combine small amounts of each product in water and observe for cloudiness, sedimentation, or gel formation. If in doubt, apply chitosan separately or consult the manufacturer’s compatibility chart.

7. Regulatory Compliance and Quality Standards

   Ensure the chitosan product complies with agricultural input regulations in your region (e.g., EPA, EU Organic Regulation, OMRI for organic farming). Certified products are more likely to meet strict limits on heavy metals, microbial contamination, and residual solvents.

   Prioritize suppliers who adhere to international quality standards such as ISO 9001 (quality management), ISO 14001 (environmental management), or CE marking. Third-party lab reports verifying purity, DoD, MW, and absence of allergens add further assurance.

Expert Tip: For best results, apply water-soluble chitosan during early morning or late evening to reduce UV degradation and enhance foliar absorption. Pair it with humic acids or seaweed extracts to amplify its bio-stimulant effects and improve plant resilience under abiotic stress.

Additional Recommendations for Farmers and Agronomists

• Start with small trial plots to assess crop response before full-field application.
• Keep detailed records of application rates, timing, weather conditions, and observed outcomes.
• Store chitosan solutions in opaque containers away from heat and light to prevent degradation.
• Consider using chitosan in integrated pest management (IPM) and organic production systems for sustainable disease control.
• Engage with technical support from suppliers for customized blending and application advice.

Selecting the right water-soluble chitosan is a science-driven decision that directly impacts crop health, yield, and sustainability. By focusing on source quality, molecular characteristics, formulation stability, and regulatory compliance, you can harness the full potential of this versatile biopolymer. When in doubt, consult agricultural extension services or certified crop advisors to ensure optimal integration into your farming practices.

Frequently Asked Questions About Chitosan in Agriculture and Human Use

Chitosan is considered safe for human use and is widely recognized as a non-toxic, natural biopolymer derived from chitin, which is found in the shells of crustaceans like shrimp and crabs. It has been approved by regulatory agencies such as the U.S. Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA) for various applications.

• Food Industry: Chitosan is used as a dietary supplement for its ability to bind with fats and cholesterol in the digestive tract, potentially aiding in weight management and lowering blood lipid levels.
• Pharmaceuticals: Due to its biocompatibility, biodegradability, and low immunogenicity, it's used in drug delivery systems, wound healing dressings, and tissue engineering scaffolds.
• Cosmetics: Found in skincare products for its moisturizing and film-forming properties that help protect and hydrate the skin.

While generally safe, individuals with shellfish allergies should exercise caution, as chitosan is derived from shellfish. However, most commercial chitosan products are highly purified and may not trigger allergic reactions in all sensitive individuals.

Yes, chitosan is an effective natural alternative to synthetic pesticides. Rather than directly killing pests, it works by enhancing the plant’s innate immune system—a process known as induced systemic resistance (ISR).

• Mechanism of Action: When applied to plants, chitosan triggers the production of defense-related compounds such as phenols, alkaloids, and terpenes, which deter insects and inhibit the growth of fungi and bacteria.
• Antimicrobial Properties: Chitosan has intrinsic antibacterial and antifungal effects, disrupting the cell membranes of pathogens like *Botrytis*, *Fusarium*, and *Phytophthora*.
• Environmental Benefits: As a biodegradable compound, it leaves no harmful residues, making it ideal for organic farming and sustainable agriculture practices.

Studies have shown that regular application of chitosan can significantly reduce disease incidence in crops such as tomatoes, strawberries, and grapes, while also minimizing reliance on chemical pesticides.

Chitosan is compatible with a broad spectrum of crops across different agricultural systems, including field crops, greenhouse vegetables, orchard fruits, ornamental plants, and even hydroponic setups.

• Fruits & Vegetables: Commonly used on tomatoes, peppers, cucumbers, strawberries, and citrus to improve disease resistance and fruit quality.
• Grains & Legumes: Applied to wheat, rice, soybeans, and corn to enhance seedling vigor and stress tolerance.
• Flowers & Ornamentals: Promotes vibrant blooms and stronger stems in roses, orchids, and bedding plants.

It is especially beneficial during critical growth stages such as seed treatment, transplanting, and flowering. While safe for most plants, it’s always recommended to conduct a small patch test or follow manufacturer guidelines when using on sensitive or new crop varieties.

Absolutely—chitosan plays a significant role in stimulating plant growth and development through multiple physiological pathways.

• Seed Germination: Enhances water absorption and activates enzymes that break seed dormancy, leading to faster and more uniform germination.
• Root Development: Encourages lateral root formation and increases root mass, improving nutrient and water uptake.
• Vegatative Growth: Stimulates cell division and elongation, resulting in stronger stems, larger leaves, and increased chlorophyll content.
• Flowering & Yield: Can accelerate flowering time and increase fruit set, ultimately contributing to higher yields and improved crop quality.

These growth-promoting effects are particularly valuable in organic farming and controlled-environment agriculture, where maximizing natural plant potential is key.

Chitosan contributes to long-term soil health by acting as a bio-stimulant and soil conditioner that supports a thriving microbial ecosystem.

• Microbial Activity: Serves as a food source for beneficial soil microbes like *Pseudomonas* and *Trichoderma*, which help suppress pathogens and enhance nutrient cycling.
• Nutrient Availability: Promotes the breakdown of organic matter, releasing essential nutrients like nitrogen, phosphorus, and potassium in plant-available forms.
• Soil Structure: Improves aggregation and porosity, leading to better aeration, root penetration, and water infiltration while reducing erosion.
• Disease Suppression: Creates an unfavorable environment for soil-borne pathogens such as nematodes, *Pythium*, and *Rhizoctonia* by boosting antagonistic microbial populations.

Over time, regular use of chitosan can transform degraded soils into fertile, biologically active growing media, supporting sustainable and resilient agricultural systems.