Related Experiment Video
Updated: Aug 21, 2026

Production of Arbuscular Mycorrhizal (AM) Fungal Inoculum and Phenotypic Evaluation of Rice and AM Symbiosis Under Saline Conditions
Published on: March 14, 2025
Nanohumic Acid Enhances Maize Yield by Modulating Soil Bacterial Communities and Grain Tryptophan Metabolism: A Novel
Chengxiang Gao1, Qiang Wang1, Jing Zhang2
1State Key Laboratory for Quality and Safety of Agro-Products, Zhejiang Provincial Key Laboratory of Agricultural Microbiomics, Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou310021, China.
Abstract:
Maize (Zea mays L.) is a major staple crop worldwide and plays a critical role in food security. Although humic acid (HA) is widely used to improve crop productivity, its effectiveness is often limited by poor dispersibility and bioavailability. Herein, nanohumic acid (NHA) with improved dispersibility was synthesized, and its effects on maize yield and underlying mechanisms were evaluated. The results showed that NHA significantly promoted maize growth and increased yield, with the highest yield under NHA15 (15 mg/kg; 31.8 g/plant), exceeding HA15 (12.8 g/plant) and CK (6.8 g/plant). Maize yield responded to NHA were concentration-dependent, showing stimulation at low doses but inhibition at high doses. NHA also enriched bacterial taxa associated with plant growth and nutrient availability and upregulated grain tryptophan metabolism, increasing IAA contents by 35.1% and 108.3% relative to CK and HA, respectively. These findings support the application of NHA for maize yield improvement.
Related Concept Videos
Microbe-Plant Interactions
The Roles of Bacteria and Fungi in Plant Nutrition
Key Elements for Plant Nutrition
Plant Breeding and Biotechnology
Microbial Corrosion
