Microbial community in buckwheat rhizosphere with different nitrogen application rates

Area of Science:

• Agricultural Microbiology
• Soil Science
• Metagenomics

Background:

• Microorganisms are crucial for sustainable agriculture.
• Excessive nitrogen fertilizer use can disrupt soil microbial structure.
• Understanding nitrogen's impact on soil microbes is vital for agricultural management.

Purpose of the Study:

• To investigate the effects of different nitrogen application rates on microbial diversity, community structure, and functionality in the rhizosphere of Tartary buckwheat.
• To assess short-term impacts of nitrogen fertilization on soil microbial ecosystems.

Main Methods:

• Application of nitrogen fertilizer at rates of 90, 120, and 150 kg/ha.
• Soil property analysis.
• Metagenome sequencing and analysis (including Linear discriminant analysis effect size and Kyoto Encyclopaedia of Genes and Genomes annotation).

Main Results:

• Soil properties did not differ significantly among treatments.
• Microbial diversity was unaffected, but community structure and functionality were altered by nitrogen application.
• Specific microbial taxa were enriched in higher nitrogen groups (N120, N150).
• Nitrogen application shifted microbial metabolic pathways, including those related to butanoate, beta-alanine, thiamine metabolism, lipopolysaccharide biosynthesis, biofilm formation, and neurodegenerative disease.

Conclusions:

• Short-term application of nitrogen fertilizer significantly alters the structure and functionality of the soil microbial community in Tartary buckwheat rhizosphere.
• Nitrogen fertilization impacts specific microbial taxa and metabolic pathways, with effects varying by application rate.