Poly-g-glutamic Acid Enhances Corn Nitrogen Use Efficiency and Yield

Strategic Insights -

Research conducted by Wenjuan Shi, Zhongmin Zhai, Lu Liu, and Bo Jing at the Xi'an University of Technology in People's Republic of China has revealed that poly-g-glutamic acid significantly improves corn nitrogen use efficiency and yield by decreasing gaseous nitrogen loss and increasing mineral nitrogen accumulation. The study, published in Soil & Tillage Research, found that gamma-PGA, a non-toxic and harmless polymer, increased corn yield by 4.94%-21.60% and nitrogen use efficiency by 4.94%-21.60% when applied at optimal rates under mulched drip irrigation conditions.

Key Takeaways:

  • The study investigated the effects of different poly-gamma-PGA application rates on soil nitrogen content, NH3 volatilization, yield, and nitrogen use efficiency in farmland ecosystems under film mulching conditions.
  • The results showed that increasing poly-gamma-PGA application rates led to increased soil mineral nitrogen accumulation, decreased cumulative NH3 volatilization loss, and improved maize yield and nitrogen use efficiency.
  • The optimal poly-gamma-PGA application strategy in the region was determined to be 70 kg ha-1, which resulted in increased corn yield by 4.94%-21.60%, increased nitrogen use efficiency by 4.94%-21.60%, and decreased nitrogen loss.
  • The study provides valuable information for improving fertilizer efficiency and reducing agricultural ecological environment pollution in corn under mulched drip irrigation conditions, ensuring sustainable agricultural development and the health of the ecological environment.

Statistics:

  • The study found that increasing poly-gamma-PGA application rates led to a 8.38%-19.39% decrease in cumulative NH3 volatilization loss.
  • The optimal poly-gamma-PGA application strategy resulted in a 4.94%-21.60% increase in corn yield and a 4.94%-21.60% increase in nitrogen use efficiency.
  • The study was conducted over a period of two years (2021-2022) in the oasis region of the desert edge in People's Republic of China.

Sources:

  • NewsRx. Findings from Xi'an University of Technology in Soil and Tillage Research Reported (Poly-g-glutamic Acid Enhances Corn Nitrogen Use Efficiency and Yield By Decreasing Gaseous Nitrogen Loss and Increasing Mineral Nitrogen Accumulation). Ecology, Environment & Conservation. July 11, 2025; p 488.
  • Shi, W., Zhai, Z., Liu, L., & Jing, B. (2025). Poly-g-glutamic Acid Enhances Corn Nitrogen Use Efficiency and Yield By Decreasing Gaseous Nitrogen Loss and Increasing Mineral Nitrogen Accumulation. Soil & Tillage Research, 249.