Applications of rhamnolipids and three major biostimulants in agriculture

In the global pursuit of sustainable agricultural development, “reducing fertilizer and pesticide use, improving quality and increasing yield, and ensuring soil health” have become core objectives. While traditional chemical inputs can solve immediate needs, they also bring about soil degradation, environmental pollution, and concerns about agricultural product safety. In this wave of transformation, green biotechnology, represented by biosurfactants and biostimulants, is moving from a “supporting role” to the center stage. Among them, the combination of rhamnolipids with three major biostimulants—algae extracts, humic acid, and amino acids—is constructing an efficient and safe agricultural ecosystem regulation scheme through its profound synergistic logic.

Applications of Rhamnolipin in agriculture

Rhamnolipids are biosurfactants produced by bacteria (primarily Pseudomonas aeruginosa). They possess a hydrophilic portion (rhamnose) and a hydrophobic portion (fatty acids). These compounds effectively reduce surface and interfacial tension, exhibit strong biological activity against pathogens, and have low toxicity. As potential plant biostimulants, rhamnolipids can also improve soil health and enhance plant tolerance to abiotic stresses. Therefore, rhamnolipids hold great potential for various industrial applications, including agriculture.

1.As a super “adjuvant” and penetrant:

Improving pesticide/fertilizer efficiency: Its superior surface activity greatly reduces the surface tension of pesticide solutions, making spray droplets spread and adhere more easily to leaves or insect surfaces, preventing them from rolling off. Simultaneously, it promotes the penetration of active ingredients through stomata or the cuticle, increasing the absorption rate of systemic pesticides and foliar fertilizers, reducing chemical pesticide usage by up to 30%.

Unlocking soil nutrients: Through emulsification and solubilization, it releases phosphorus, potassium, and trace elements fixed in the soil, converting them into forms that plants can absorb, essentially activating the soil’s “stored” nutrients.

2.As a biopesticide and immune inducer:

Directly inhibiting bacteria: It can disrupt the cell membranes of fungi (such as powdery mildew and downy mildew) and also inhibits certain bacteria.

Inducing systemic resistance: As a microbial signaling molecule, it can activate plant defense pathways such as jasmonic acid and salicylic acid, allowing plants to produce more disease-resistant substances, acting as a “vaccination” effect.

3.As a soil remediation agent:

It effectively emulsifies and disperses organic pollutants such as hydrocarbons and pesticides in the soil, promotes their degradation by microorganisms, and improves continuous cropping obstacles and polluted soil.

Applications of Three Major Biostimulants in Agriculture

The core function of biostimulants is to “regulate” and “nourish” plant physiological processes, rather than directly providing large amounts of nutrients.

1. Seaweed Extract

• Core Components: Seaweed polysaccharides (such as fucoidan, alginate), betaine, natural plant hormones (auxins, cytokinins, gibberellins), minerals.

• Main Functions:

a.Promotes Growth and Development: Stimulates cell division and elongation, promotes root development, flowering, and fruit retention.

b.Enhances Stress Resistance: Betaine and seaweed polysaccharides regulate cell osmotic pressure, protect membrane structures, and significantly improve crop tolerance to drought, salinity, high temperature, and low temperature.

c.Improves Quality: Increases fruit sugar content, color, and firmness, and extends shelf life.

2. Humic Acid/Fulvic Acid

• Core Components: Large molecular organic matter formed from the decomposition of animal and plant residues by microorganisms; the smaller molecular weight and most active portion is called fulvic acid.

• Main Functions:

a.Soil Improvement: Acts as a “glue” for soil aggregates, improving soil structure, increasing porosity, and enhancing water and fertilizer retention.

b.Nutrient Chelation and Transport: Possesses strong chelating ability, binding with micronutrients to prevent fixation and carrying them to the plant roots for absorption.

c.Root Development Stimulation:Acts directly on the roots, stimulating root hair growth and expanding the absorption area.

3. Amino Acids/Polypeptides

• Core Components: Free amino acids and small peptides produced by the hydrolysis or fermentation of animal hair, plant residues, etc.

• Main Functions:

a.Rapid Replenishment of Organic Nitrogen Source:** Can be directly and rapidly absorbed and utilized by plants, alleviating nitrogen demand under abiotic stress with rapid results.

b.Physiological Regulation:** Certain amino acids (such as proline and glycine) are themselves osmotic regulators, enhancing stress resistance; tryptophan is a precursor for auxin synthesis.

c.Chelation Carrier: Also possesses chelating properties, promoting micronutrient absorption.

Collaborative Applications: Building a “1+3” High-Efficiency Agricultural Solution

While each of these products alone has yielded significant results, the true revolutionary breakthrough lies in their synergistic application. The combination of rhamnolipin and the three major biostimulants is not a simple additive process, but rather produces a systemic multiplier effect of “1+1>2”.

Rhamnolipin + Seaweed Extract: This combination is a golden pair for stress resistance and quality improvement. Rhamnolipin, as a highly efficient “transport carrier,” ensures that the larger molecular weight active substances (such as polysaccharides and hormones) in seaweed can be fully absorbed by crops. The two work synergistically in activating pathways of plant systemic resistance (such as cold and drought resistance), making crops more resilient to climate change while maximizing the quality-improving effect of seaweed fertilizer.

Rhamnolipin + Humic Acid: This is the ultimate solution for soil remediation and root activation. In the soil, rhamnolipin is responsible for “unlocking” fixed nutrients, while humic acid (especially fulvic acid) is responsible for “transporting” and escorting these nutrients to the root surface. The combined effect of these two ingredients effectively revitalizes compacted, salinized, or continuously cropped soils, strongly stimulating new root development and establishing a robust underground absorption network for crops.

Rhamnolipids + Amino Acids: This combination can be considered a “rescue solution” for crops after disasters. After drought, waterlogging, or pesticide damage, the penetrability of rhamnolipids delivers amino acids to damaged plant tissues at the fastest speed, directly providing repair materials and energy, helping crops recover in the shortest possible time.

A more forward-thinking approach is to combine rhamnolipids with products containing multiple biostimulants. In this mode, rhamnolipids act as a “system enhancer”—improving the absorption and utilization efficiency of the entire compound product, while its own biopesticide and immune-inducing functions are deeply integrated with the growth-promoting and stress-resistance functions of biostimulants. This allows growers to achieve multiple goals simultaneously—”improving soil, promoting absorption, enhancing resistance, and improving quality”—with a single application, greatly simplifying the management process of green cultivation and significantly reducing dependence on chemical fertilizers and pesticides.

Combination Schemes	Synergistic Effect Principle	Typical Application Scenarios
Rhamnolipids + Seaweed Extract	Rhamnolipids act as both a “transport vehicle” and a “locksmith,” significantly improving the adhesion, penetration, and absorption efficiency of macromolecules and active substances such as polysaccharides and hormones in seaweed fertilizer on the leaf surface. The two have a synergistic effect in inducing stress resistance (cold resistance, drought resistance).	Stress Resistance and Quality Improvement: Used for fruit trees and vegetables when encountering low temperatures and drought during flowering and young fruit stages, or before the color-changing stage to improve quality.
Rhamnolipids + Humic Acid/Flavic Acid	In the soil, rhamnolipids release fixed nutrients, while fulvic acid chelates and transports these nutrients to the root surface. The two work together to powerfully activate soil fertility and jointly stimulate root growth, improving the soil microecology.	Soil Remediation and Root Promotion: Used for the improvement of newly reclaimed land, compacted land, and saline-alkali land, or for root dipping and drenching during seedling transplanting and planting.
Rhamnolipids + Amino Acids/Peptides	Rhamnolipids help amino acids quickly enter the plant body. After crops suffer from pesticide damage, frost damage, waterlogging, or other adverse conditions, this combination can quickly replenish the plant’s “nutrient solution,” repair damage, and restore growth.	Emergency Treatment and Recovery: After severe weather, after pesticide damage has subsided, and after harvesting, to help the tree recover its vigor.
Rhamnolipids + Triad-Based Compound Product	This is the most comprehensive solution. Rhamnolipids, as a “universal adjuvant” and “immune activator,” are combined with a compound biostimulant that integrates “nutrition, stimulation, and improvement” functions to achieve multiple goals such as fertilization, disease prevention, stress resistance, soil improvement, and quality enhancement, while significantly reducing the amount of chemical inputs used.	Green/Organic Agriculture Management: Can be used during the critical growth stages of high-value-added cash crops as a core solution for replacing or reducing the use of chemical pesticides and fertilizers.

In summary, the combination of rhamnolipin with the three major biostimulants represents a cutting-edge direction in the transformation of modern agriculture from “chemical dependence” to “biological regulation.” With its unique physicochemical and biological functions, rhamnolipin acts as an “accelerator” and “synergist” for biostimulants, making bio-agricultural solutions more efficient and reliable, and providing a powerful technological toolkit for achieving the sustainable development goals of “reducing fertilizer and pesticide use, improving quality and increasing yield, and promoting soil health.”

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