What is silicone, how does it differ from silicon?

What is Silicon?

Silicon is an important and beneficial nutrient element. Although it is not an essential nutrient element for plant growth, (bioavailable) silicon has a significant impact on plants. By building an “internal framework” and “external armor” for plants, it fundamentally enhances the plant’s constitution, achieving the comprehensive goals of stress resistance, disease resistance, increased yield, and improved quality.

What is silicone?

Silicone, also known as silicone resin or polysiloxane, is a class of synthetic polymers whose backbone consists of alternating silicon (Si) and oxygen (O) atoms, while the side chains are typically linked to organic groups (such as methyl, phenyl, etc.). In agriculture, silicones are commonly found as surfactants. Also known as organosilicon adjuvants (silicone surfactants in agriculture), they are a class of surfactants containing silicon-oxygen bonds. In agriculture, they are frequently added to formulations of pesticides, fungicides, herbicides, plant growth regulators, and foliar fertilizers. The chemical properties of silicones endow these molecules with unique properties, making them ideal spreading and penetrating agents in crop protection chemicals and fertilizers.

Properties and Mechanism of Action: The structure of silicone surfactants, particularly their silicon backbone and polyether side chains, makes them extremely stable in humid environments and at high temperatures. As surfactants, they significantly reduce the surface tension of aqueous solutions more effectively than conventional surfactants. This allows them to spread more quickly on hydrophobic surfaces, such as plant leaves and cuticles. Compared to conventional surfactants, silicone surfactant molecules also exhibit superior surface activity, which contributes to the encapsulation, wetting, and uniform dispersion of active ingredients.

The hydrophobic siloxane backbone adheres firmly to the waxy and lipid layers on plant tissue surfaces. This allows surfactants to effectively bind pesticide or nutrient molecules and deliver them more efficiently across these waxy barriers. Studies have shown that siloxane surfactants promote rapid absorption and high retention of agrochemicals by plants. Compared to other adjuvants, siloxane surfactants are also more resistant to rain or irrigation washout.

Applications and Advantages of Silicone Surfactants in Agriculture:

1.Extremely low surface tension: Reduces the surface tension of water from 72 mN/m to approximately 20 mN/m, significantly lower than ordinary adjuvants.

2.Superior spreading ability: The solution instantly spreads into an extremely thin, uniform, and continuous water film on plant leaves (especially those with a thick, hydrophobic wax layer), rather than forming isolated water droplets.

3.Powerful permeability: Rapidly penetrates through stomata and other channels, enhancing the effectiveness of systemic pesticides.

Specific Roles and Advantages in Agriculture:

1. Maximum Coverage, Minimizing Dead Zones

Problem: Pests and pathogens often hide in “dead zones”—the undersides of leaves, petioles, and crevices in stems—that are difficult for pesticides to reach.

Solution: Organosilicon adjuvants allow the pesticide solution to quickly cover the front and back of leaves, leaf edges, and even the base of the hairs, greatly increasing the contact area between the pesticide and the target, eliminating hidden enemies.

2. Rain-Resistant, Long-Lasting Efficacy

Problem: If it rains immediately after spraying, ordinary pesticide solutions are easily washed away, resulting in waste and environmental pollution.

Solution: Organosilicon adjuvants promote rapid penetration and adhesion of the pesticide solution, forming a stable film after drying on the leaves, significantly enhancing its resistance to rain washout.

3. Significantly Improved Efficacy, Savings in Pesticides and Labor

Enhanced Efficacy: Wider coverage and stronger adhesion mean higher efficacy with the same dosage.

Reduced dosage: Under the premise of achieving the same control effect, pesticide use can usually be reduced by 20%-30%, which is in line with the green agriculture goal of “reducing pesticide use and increasing efficiency”.

Water saving: Due to its good spreadability, the amount of spray solution per acre can be reduced.

4. Solving the problem of “difficult-to-wet” crops

Problem: Rice, cabbage, onions, garlic, etc. have thick waxy leaves, or citrus, azaleas, etc. have highly hydrophobic leaves, making it easy for ordinary pesticide solutions to roll off.

Solution: Organosilicon is a powerful tool for overcoming these “difficult-to-apply” crops, ensuring effective adhesion of the pesticide solution.

5. Promotes absorption and faster onset of action

For systemic pesticides/foliar fertilizers: Organosilicon helps them enter the plant body more quickly through stomata and the cuticle, shortening the onset time and improving the utilization rate of nutrients or pesticides.

The key difference between silicon and silicone in agriculture

Applications of Silicon in Agriculture

Here, “silicon” refers to bioavailable silicon or silicon fertilizer, typically in the form of monosilicic acid.

1.Role: A beneficial nutrient element (not essential for all plants, but crucial for many crops such as rice, sugarcane, and cucumber).

2.Mechanism of Action: After plants absorb silicic acid, it deposits in the cell walls and intercellular spaces, forming solid, amorphous silica gel or silicified cells, acting like an “internal skeleton” and “external armor” for the plant.

3.Main Functions:

• Strengthened Structure: Makes stems thicker and significantly reduces lodging resistance.

• Pest and Disease Defense: Silicon deposition thickens and hardens cell walls, forming a physical barrier that hinders pathogen invasion and insect piercing and sucking, known as “physical defense.”

• Enhanced Stress Resistance: Enhances plant resistance to abiotic stresses such as drought, salinity, and heavy metal toxicity.

• Improved Photosynthesis: Makes leaves upright, reduces shading, and improves light energy utilization.

4.Common products include: calcium silicate fertilizer, potassium silicate, and water-soluble silicon fertilizer.

Applications of Silicone in Agriculture

Here, “silicone” mainly refers to organosilicone surfactants (a type of modified silicone oil), and some silicone sealants/coatings.

1.Role: A highly efficient agricultural adjuvant or functional material that does not provide nutrients itself.

2.Mechanism of Action: Utilizing its extremely low surface tension, excellent spreadability, and film-forming properties, it alters the physical properties of liquids or surfaces.

3.Main Functions:

• As a super spreader/adjuvant:

Added to pesticides (insecticides, fungicides, herbicides) or foliar fertilizers.

Function: Significantly reduces the surface tension of the pesticide solution, allowing it to spread rapidly into a uniform film on waxy leaves instead of forming droplets that roll off. This increases coverage area, improves efficacy, and reduces pesticide dosage and runoff.

• As an antifoaming agent: Used in pesticide production and formulation to eliminate foam.

• As a soil moisture retainer (less commonly used): Some silicone products can improve soil structure and inhibit water evaporation.

• As physical protective materials:

Tree wound protectant: Apply silicone sealant to pruning wounds to prevent moisture evaporation and pathogen invasion.

Grafting bandage: Elastic and breathable, promoting healing.

4.Common products: “Organic silicone adjuvants”, agricultural spray adjuvants (such as “Jiexiaoli”, “Beirun”, and other brand products), horticultural wound healing agents.

Key Differences Summary

Comparison Dimensions	Silicon	Silicone
Essence	Inorganic Nutrient/Fertilizer	Organic Polymer Additive/Material
Target Plants	Absorbed by plants, becoming part of their structure	Applies to the surface of plants or pesticides, without altering chemical composition
Main Functions	Enhancing plant constitution from within (strong stems, disease resistance, stress resistance)	Optimizing application effects from the outside (synergistic effect, water conservation, protection)
Method of Action	Physiological and biochemical processes, deposited as a solid	Physical processes (spreading, film formation, coverage)
Relationship/Analogy	Like giving a person “calcium to strengthen bones”	Like equipping a sprayer with a “high-pressure atomizing nozzle”

Conclusion: In modern precision agriculture, the role of silicones (organosilicone surfactants) can be figuratively described as equipping pesticides and foliar fertilizers with a “precision guidance system” and a “high-speed delivery channel.” Through its unparalleled spreading, penetrating, and adhering abilities, it solves the fundamental problem of “the pesticide reaching the target” in pesticide spraying. Silicon and silicones are often used synergistically—on the one hand, by applying silicon fertilizers to enhance the crop’s own resistance, and on the other hand, by using silicone adjuvants to improve the efficiency of pesticide and fertilizer use, jointly achieving the goals of increased yield, reduced pesticide use, and environmental protection. Their complementary functions represent two completely different but important agricultural inputs.

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