Poly-γ-Glutamic Acid Rhamnolipid Ester (APAA) ---Another choice for Synergistic Fertilizer

In agricultural cultivation, the low utilization rate of chemical fertilizers has become an urgent issue to address, leading to increasing problems such as environmental pollution, soil acidification, soil compaction, soil salinization, and poor crop stress resistance. As an innovative biosynthesized biostimulant, APAA features over 1,000 highly hydrophilic groups and negatively charged functional groups, giving it outstanding solubility and pH stability. It effectively chelates and adsorbs nutrient ions and water molecules in the soil, improving soil structure and physicochemical properties, enhancing water and fertilizer efficiency, and ultimately boosting crop growth, yield, and quality.

Features of APAA

1. Outstanding water dissolving property

When diluted at a ratio of 20 to 2,000 times, APAA remains fully water-soluble and stable in solution, making it suitable for conventional foliar spraying as well as drone-based aerial application.

2. Excellent Stability across a wide pH range

APAA solution remains stable within a pH range of 2 to 12, making it widely applicable for fertilizer production, processing, and the formulation of fertilizer-pesticide combinations.

The above properties of APAA make it suitable for the production of various of fertilizers.

3. Status of different fertilizers after adding APAA

Adding APAA to various types of fertilizers can effectively improve the color, odor, and stability of the fertilizers, enhancing the differentiation of the fertilizer products.

Trials of APAA’s synergistic effect

1. Synergistic Effect to Water Soluble Fertilizer

Crop: Leaf Lettuce

Treatments: CK: Water soluble 18-18-18, 150kg/ha, fertigation

                    T1: 18-18-18 + 0.5% of APAA, 150kg/ha, fertigation

                    T2: 18-18-18 +0.7% of APAA, 150kg/ha, fertigation

Result: When the application rate of APAA reached 7‰, Leaf lettuce demonstrated optimal growth performance:

• The growth rate peaked, with canopy coverage reaching its maximum level.

• Yield increased by 16.6% compared to CK.

• Nutrient utilization efficiency significantly improved, with NPK uptake enhanced by 19%, 12%, and 7% respectively.

2. Synergistic Effect to Compound Fertilizer

Crop: Pak Choi

Treatments: CK: Granule 15-15-15, 600kg/ha, top dressing

           T1: 15-15-15 + 0.3% of APAA, 600kg/ha, top dressing

           T2: 15-15-15 + 0.5% of APAA, 600kg/ha, top dressing

           T3: 15-15-15 + 0.7% of APAA, 600kg/ha, top dressing

Result: The addition of APAA to compound fertilizer significantly enhanced the growth of Pak Choi with increased plant height and leaf number. Specifically:

• The optimal effects were observed at APAA application rates of 5‰ and 7‰, resulting in 12.2% and 14.0% yield increases, respectively.

• Economic returns improved by CNY3120/ha and CNY3570/ha (compared to CK).

In summary, APAA exhibits exceptional solubility and acid-base stability. When incorporated into fertilizers, it enhances product differentiation while significantly improving fertilizer utilization efficiency. This additive promotes robust crop growth performance, increases biomass accumulation, and ultimately boosts both yield and quality.

Booth No. 22H18 – See you at CAC 2025! Further details will be discussed in person during our meeting.

Contact: eileen.wang@coub.cn 

Tel: 86-532-85901608

Website: www.seawin-bio.com 

Linkedin: https://www.linkedin.com/company/qingdao-seawin-biotech-group

FaceBook: https://www.facebook.com/profile.php?id=100064125487612