Spraying Effect of Fertilizer Synergist Polyglutamic Acid on Ginger

We applied “polyglutamic acid” 1∶500 times and 1∶300 times dilution on the leaf surface of ginger, and compared and analyzed the stem height, branches, leaf length, leaf width, fresh weight of stem and leaf, and weight of fresh ginger stem and block.

Polyglutamic acid functions are: it can have a strong boiling function for the nutrients needed by plants, strengthen the absorption of nitrogen, phosphorus, potassium and medium and trace elements by plants, solidify the fertilizer in the soil, reduce the loss of fertilizer in the soil, and improve the fertilizer utilization rate, thereby reducing fertilizer usage.

Adjust the pH of the soil, avoid the acidic soil caused by the long-term use of chemical fertilizers, and provide a good living environment for soil microorganisms.

It has super hydrophilic and water retention capabilities; it integrates plant nutrition and water-active components in the soil to enhance resistance to symptoms caused by soil-borne plant pathogens.

Polyglutamic Acid on Ginger

Testing Condition of Ginger

1. Soil Condition: It’s sandy loam with good air permeability, water retention and fertility retention, which is suitable for ginger planting. Before the test plot, there was no ginger warm disease and ginger stem base rot for 3 consecutive years, and watering and drainage were very convenient.


2. Test Product: This test uses a polyglutamic acid synergist, the main component of which is poly-γ-glutamic acid (γ-PGA). The main functions are synergy, fertilizer preservation, chelation, disease resistance, and slow release.

3. Group of Experiments: Total 3 groups

  • Group 1: CK Group
  • Group 2: Foliar Spray Polyglutamic acid 1:500 diluted
  • Group 3: Foliar Spray Polyglutamic acid 1:300 diluted
Spray once every 7-10 days, spraying 5 times in total.


Table 1. Effect of Polyglutamic Acid on the Ginger Growth


Plant Height (cm)

Crop Branches (cm)

Leaf Length (cm)

Leaf Width (cm)

Fresh Weight of Stem & Leaf (g/plant)

Fresh Ginger Stem Weight (g/plant)























Polyglutamic acid has obvious promoting effect on the growth and development of ginger. Foliar spraying during the growing season can effectively increase the height, branches, leaf length, leaf width, and fresh weight of stems and leaves of ginger. At the same time, it also shows dark green leaves, thicker leaves, and thicker stems.

Polyglutamic acid can improve the resistance of ginger to common diseases and insect pests.

Through field experiments, the incidence of common diseases such as spot disease, anthracnose, and sheath blight of ginger in the experimental area sprayed with polyglutamic acid was significantly lower than CK Group.

The incidence of common pests such as ginger worm, beet armyworm and thrips was also significantly lower than CK group.

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