Adjuvants in Biostimulant Applications
Biostimulants – substances enhancing nutrient efficiency, stress tolerance, and crop quality – are revolutionizing sustainable agriculture. Yet, their efficacy hinges on effective delivery. This is where surface Adjuvants (surfactants, wetting agents, spreaders) become game-changers, creating powerful synergies with biostimulants to maximize results.
Why Adjuvants & Biostimulants Are Better Together
Biostimulants (seaweed extracts, humic acids, amino acids, microbes) work inside the plant or rhizosphere. Surface additives work on the surface:
- Breaking Barriers: Plant surfaces (waxy cuticles) repel water-based biostimulants. Additives reduce surface tension, enabling uniform spreading and adhesion.
- Enhancing Uptake: Improved wetting allows biostimulants to contact stomata or penetrate cuticles more effectively. Organosilicone Adjuvants are particularly efficient.
- Reducing Runoff: Adjuvants increase droplet retention on leaves or soil, minimizing waste from rain or irrigation.
- Protecting Actives: Some additives shield sensitive biostimulants (e.g., microbes) from UV degradation or rapid drying.
- The Synergy: Additives ensure more biostimulant reaches its target, faster and more efficiently, amplifying its inherent benefits. Studies show combinations can increase efficacy by 20-50% compared to biostimulants alone.
Recommended Adjuvants in Biostimulant Combination Strategies in the Market:
Growers and formulators use these proven approaches:
1. Foliar Applications (Most Common):
- High-Performance: Organosilicone Surfactants (e.g., trisiloxane ethoxylates) + Amino Acid/Humic Acid Biostimulants.
- Cost-Effective: Non-ionic Surfactants (e.g., alcohol ethoxylates) + Seaweed Extracts/Fulvic Acids.
- Microbial Protection: Spreaders/Stickers + Microbial Biostimulants (PGPR, Trichoderma, mycorrhizae).
2. Soil/Seed Applications:
- Humectants + Humic Acids/Fulvic Acids: Humectants (e.g., glycerin derivatives) attract and retain soil moisture around the seed/root zone, enhancing the activity of humic substances that improve nutrient availability and root growth.
- Soil Penetrants + Microbial Consortia: Penetrants help water-soluble biostimulants (like specific bacteria/fungi inoculants) move into the root zone more effectively, especially in hydrophobic soils.
Practical Tips of Adjuvants in Biostimulant for Use:
- Compatibility First: Always conduct a jar test before tank-mixing. Some Adjuvants can destabilize microbial biostimulants.
- Dose Matters: Follow label rates! Too much surfactant can cause phytotoxicity; too little reduces efficacy.
- Water Quality: Hard water can reduce surfactant performance. Consider ammonium sulfate (AMS) buffers if needed.
- Target Timing: Apply during optimal plant uptake windows (e.g., early morning for foliar) when combined with Adjuvants .
